Microsoft’s Windows is the most widely used computer operating system in the world, accounting for ** percent share of the desktop, tablet, and console OS market in March 2025. Apple’s macOS ranks as the next most widely used operating system, while its iOS mobile operating system, the standard installation on all iPad devices, ranks fourth. Linux OS versions serve as the primary option for users who prefer open-source software and intend to avoid the influence of major OS developers. Operating Systems Operating systems serve as the underlying platforms which connect computer hardware and software. They provide users with the graphical interface through which they issue commands and perform tasks on electronic devices. Billions of people make use of these devices and their operating systems on a regular basis, meaning that the companies that develop these widely used technologies have a great deal of influence on the daily lives of internet users around the world. Although Microsoft Windows is the clear leader in terms of desktop operating systems, the company’s mobile device operating system failed to make a successful transition into the smartphone market, where Android and iOS are essentially the only two options.

Android maintained its position as the leading mobile operating system worldwide in the first quarter of 2025 with a market share of about ***** percent. Android's closest rival, Apple's iOS, had a market share of approximately ***** percent during the same period. The leading mobile operating systems Both unveiled in 2007, Google’s Android and Apple’s iOS have evolved through incremental updates introducing new features and capabilities. The latest version of iOS, iOS 18, was released in September 2024, while the most recent Android iteration, Android 15, was made available in September 2023. A key difference between the two systems concerns hardware - iOS is only available on Apple devices, whereas Android ships with devices from a range of manufacturers such as Samsung, Google and OnePlus. In addition, Apple has had far greater success in bringing its users up to date. As of February 2024, ** percent of iOS users had iOS 17 installed, while in the same month only ** percent of Android users ran the latest version. The rise of the smartphone From around 2010, the touchscreen smartphone revolution had a major impact on sales of basic feature phones, as the sales of smartphones increased from *** million units in 2008 to **** billion units in 2023. In 2020, smartphone sales decreased to **** billion units due to the coronavirus (COVID-19) pandemic. Apple, Samsung, and lately also Xiaomi, were the big winners in this shift towards smartphones, with BlackBerry and Nokia among those unable to capitalize.