An overview of Linux, from the foundational program to its related operating systems

The history of Linux, from the UNIX wars to the hundreds of Linux operating systems of today

Amid conflicts over standardizing and controlling various versions of UNIX—an operating system developed at Bell Labs and owned by AT&T—the GNU Project was announced to create a free, open-source OS. Originally designed for Intel's 386 CPU under the name "Freax," Linus Torvalds Linux kernel would be combined with GNU Project software and customized by growing numbers of developers into many OSes, each tailored to specific computing needs.

An overview of a dozen distros—operating systems running on the Linux kernel

While Ubuntu and Linux Mint are among the most beginner-friendly general-use operating systems, Arch Linux is a more advanced option, with a dedicated Arch Wiki available for support. Many Linux distros are optimized for specific use cases, such as Kali Linux for security work and Pop!_OS for high-performance gaming and software development.

The origin of Linux-based operating systems and why calling them 'Linux' is controversial

When Linus Torvalds developed the Linux kernel—the foundational layer of an operating system—developers incorporated it into other readily available components of the GNU Project to create complete systems. Although these OSes have been colloquially referred to as "Linux" for simplicity for decades, the GNU Project has long argued that they should be called "GNU/Linux" to honor the project's contributions.

Linux adoption statistics, including its use in all the world's top 500 supercomputers since 2017

This has been driven by kernel-level customizations available with Linux-based operating systems that improve computational performance and reduce latency. As of 2025, Linux's desktop market share is 3.7%, but 87.8% of machine learning workloads run on Linux infrastructure. The Linux OS market is expected to grow 105.8% through 2029.

A list of technologies that run on Linux, including those on the International Space Station

Besides the Astrobee robots and computer systems on the ISS, the security and reliability of Linux distros have led to their use by the Federal Aviation Administration, the Pentagon, the Library of Congress, and the New York Stock Exchange. Many of the operating systems found in smart devices, autonomous vehicles, and wearables also run atop the Linux kernel.

Distinguishing between Android and Linux-based operating systems

The Google-owned OS for mobile devices runs atop a Linux-based kernel that manages core services and manages software communication with hardware. While many Linux distributions can often be installed on these devices, Android uses its own standard libraries, user interface, and other open-source software, which comprise the Android Open Source Project.

A conversation about open-source software with Linus Torvalds, who invented Linux

Originally written as part of a personal project, Torvalds acknowledges that Linux's growth came from opening it up to a community of users who could each work on different components, including those that were not his strength, such as the user interface. He also admits to being an engineer, rather than a visionary, relating more to Thomas Edison than Nikola Tesla.

Explaining computer kernels and what makes monolithic kernels different from microkernels

A kernel is an intermediary piece of software on a device that manages the connection between software programs—the services and processes they perform to run correctly—and the available hardware resources, such as memory and computing bandwidth, including prioritizing resource allocation and managing access to specific hardware. A monolithic kernel manages all of an operating system's services, whereas a microkernel only handles essential services.

The history of the Linux Foundation, a technology consortium supporting open-source projects

The nonprofit, founded in 2000 by IBM, HP, Intel, and others as the Open Source Development Labs, was established to build the infrastructure needed to scale with the growing development of Linux. Upon merging with the Free Standards Group in 2007, it rebranded as the Linux Foundation and, as of 2024, provides a "neutral home for code and collaboration" to almost 1,000 projects.

Visualize the growth of the Linux kernel source code, which surpassed 40 million lines in 2025

Version 0.01 of the program authored by Linus Torvalds in 1991 spanned approximately 10,000 lines of code and has progressively grown to accommodate the management of an increasing number of hardware and software components. The kernel grows by an estimated 400,000 lines of code every two months.

Explaining how open source systems like Linux can be secure, despite their public source code

While no computer system is immune to all cyberattacks and malware, the transparency of open-source technology means many thousands of developers can review and oversee the underlying code powering the software on an ongoing basis. This increases the likelihood of catching and patching vulnerabilities more quickly than smaller groups of cybercriminals looking to exploit them.

Read Linus Torvalds' commenting on his first posts about Linux in the comp.os.minix newsgroup

On August 1, 1991, he posted a request on what would be the first version of Linux, writing, "I'm doing a (free) operating system (just a hobby, won't be big and professional like gnu) for 386(486) AT clones. [...] I'd like any feedback on things people like/dislike in minix, as my OS resembles it somewhat."

The stories behind open-source project logos, including Tux, Linux's penguin mascot

During a trip to an Australian zoo, Linus Torvalds, the developer of the Linux kernel, was bitten by a penguin, which inspired the animal to be selected as the software's logo. The first design was drafted by Larry Ewing while a student at Texas A&M University, and the Tux name—short for tuxedo—aligned with the animal's appearance.

How a crisis over managing Linux versions led to the foundational software behind GitHub

In 2005, after enduring several challenges with BitKeeper—the system then used to manage the Linux source code—Linus Torvalds spent about 10 days writing code for Git, a new system to organize and track versions throughout kernel development. Git provides distributed version control for GitHub, which, as of 2023, is the world's largest host of software development projects.

View the codenames given to Linux kernel releases, from 'Woozy Numbat' to 'ninja sloth'

While each version is assigned a code, such as 6.8.0-rc7, animal codenames provide more memorable, fun identities for each version. Some Linux distributions have also adopted this philosophy and have used alliterative nicknames to convey the distro's characteristics, such as Ubuntu's "Warty Warthog," described as "functional if not pretty."

Learn about the Linux contingency plan for when its creator retires or passes away

Authored 34 years after the software was coded by Linus Torvalds, the plan dictates that if the maintainers of the code's repository are unable to facilitate a transition to Torvalds' successor, an Organizer will chair a meeting with the invitees of the most recently concluded Maintainers Summit, which will consider options for the ongoing management of the repository.

How Steve Jobs tried to end development on Linux by offering Linus Torvalds a job

In a 2012 interview, Linus Torvalds claimed that the Apple CEO offered him a job in 2000 to exclusively work on Mac OS's Mach kernel. While Linux has not provided the financial benefits that a business venture with Apple may have, Torvalds stated, "I'm very happy with feeling that I've done the right thing." (Some readers may experience a paywall.)

A timeline of computer history

The earliest computers bear little resemblance to the computing devices that most people rely on today. This timeline graphic from the Computer History Museum tracks their evolution, from the early days of bulky mainframes that only experts generally used through to the personal computing revolution and on to the modern mobile era. Readers will learn important context ahead of the next major computing platform shift.

With many smaller computing cores, graphics processing units process many identical tasks in parallel, whereas central processing units have fewer, larger cores built to handle a wide variety of more complex tasks sequentially.

All computers are defined by their ability to input, store, process, and output data

From wooden machines to wearable tech, computers have changed a lot in appearance, but they all still perform the same essential tasks. Early computers were made of wood and metal—some were so big that they filled entire rooms just to solve simple math problems.

Why the Linux Foundation partnered with the Academy of Motion Picture Arts and Sciences

In founding the Academy Software Foundation in 2018, the Linux Foundation spread its open-source philosophy to the cinema by establishing a neutral forum for sharing animation, visual effects, and audio technologies across projects. Its founding members include DreamWorks Animation, Epic Games, Google Cloud, Intel, and Walt Disney Studios.

Explore a visual history of the Windows operating system

Named after the windows that separate different applications, the operating system’s first version came preinstalled with Calculator, Paint, and Reversi. There was no Windows 9 to avoid compatibility issues with legacy code searching for Windows 95 and 98 files via a “windows9” query.

Microsoft paid $50k for the foundation of the OS they licensed to IBM

Rather than write MS-DOS from scratch, Bill Gates purchased the full rights to QDOS—Quick and Dirty Operating System—from Seattle Computer Products only weeks before IBM's PC hit the market. The IBM deal allowed Microsoft to license its OS to other manufacturers, ensuring it was not dependent on IBM's long-term success.

Creating malware requires more than knowledge of programming languages

Because computer viruses, worms, and other malicious software reside within a computer's operating system, which manages computer hardware and software, cybercriminals writing effective malicious code must understand how the OS manages input and output, permissions, memory, etc. Knowledge of credentials and network access also helps create malware that easily spreads.

How the GNU General Public License ensures software remains free and open

Rather than copyright, the free software license is based on the principles of copyleft—users are allowed to use, modify, and distribute software without charge, provided that any derivative works remain free. The license was introduced in 1989 by Richard Stallman, who founded the Free Software Foundation to promote the accessibility of software.

An overview of 12 fundamental types of algorithms and the uses for each

These include search algorithms to quickly process and find important information, cryptographic algorithms to secure communications, randomized algorithms—such as Monte Carlo simulations for estimating probabilities of outcomes—and greedy algorithms, which make optimal choices based on available data in a step-by-step fashion, as seen in navigation apps.

A breakdown of algorithms, how they are constructed, and their applications

Algorithms are instructions for accomplishing a goal and typically take the form of a step-by-step procedure. Given the conditions, these procedures can take various paths, increasing an algorithm's complexity. While traditional computer algorithms are programmed to account for all possible scenarios within a given process, machine learning systems build their own rules from data-driven patterns.

View a library of custom programs that can be loaded onto graphing calculators, including productivity tools, reference materials, games, and interactive applications, such as prom proposals.

The internet explained at five levels of difficulty, from protocols to internet flattening

Resembling a roadway with traffic laws that all cars must follow, the internet is the hardware that connects a source to a destination, and these connections must follow specific software rules. Although data had to travel through about 10 networks to reach a destination in the past, data centers increasingly consolidate traffic, just as a highway does for cars, to improve data speeds.

Explore an online gallery highlighting the importance of graphical user interfaces

Before the Macintosh, computers were primarily used in offices and required users to type complex commands to perform tasks. Apple followed the device with the LaserWriter printer, bringing graphic production to at-home artists and designers.

An explanation of TCP/IP, which helps transmit data across the internet like a club sandwich

The system consists of several layers—application, transport, internet, and network—each responsible for specific tasks. These include interacting with a web browser, checking for errors, sending packets of data across various networks to avoid congestion on their way to a destination address, and managing the transmission of information across hardware, such as an Ethernet cable.

Explore the components of autonomous vehicles controls

A suite of cutting-edge hardware and computation-intensive software creates the potential for self-driving cars to be safer, more fuel-efficient, and more accessible to a broader range of drivers. However, automation also introduces potential cybersecurity threats.

Ethereum is a blockchain-powered operating system known for its cryptocurrency, ether

Ethereum's underlying blockchain allows developers to build decentralized applications (dApps) that leverage smart contracts to seamlessly run decentralized financial tools (crypto wallets, exchanges, marketplaces, and more), along with Web3 concepts like non-fungible tokens.

Upgrade cost and compatibility issues have kept Microsoft's legacy systems alive

As of 2025, Windows XP and Windows NT continue to power ATMs and transit systems, while Deutsche Bahn's trains use Windows 3.11 for display systems. Microsoft's continued support for these operating systems helps it maintain its dominance in the business sector.

An overview of the World Wide Web, which is often confused with the internet

When users create a website, they organize content and store it on a web server—one of various types of hardware that make up the internet—in web languages, such as HTML and JavaScript. When visiting the site, a web browser translates these languages into text and other media for consumption.

A simple explanation of semiconductors

Semiconductor chips are electronic devices that store and process information. Today they can contain billions of microscopic switches on a chip smaller than a fingernail. The article provides a quick overview of how the devices work and how they've provided the backbone of the computer age.

Graphics processing units, which process large amounts of data in parallel, have become the foundational hardware for AI systems that rely on hardware capable of processing millions of text parameters simultaneously.

Biohacking: The effort to optimize health and extend life through technology

Biohacking seeks to optimize human health and performance through everything from simple lifestyle adjustments to more radical interventions like body modifications and experimental technology. At its core, biohacking covers a wide spectrum—ranging from improving sleep and focus to implanting devices that integrate technology with the human body.