Windows

Windows is the successor to MS-DOS. It started as a program which could run on DOS, and would allow for the use of a graphical window manager, hence the name. 

Windows was known at the time for bringing a number of new features before its competitors, and because it was already available on computers which ran MS-DOS, it had an advantage in growing its market share compared to its competitors. Notably, Microsoft Windows was the first major window manager to bring the feature known as 'windows snapping', where by moving a window to a certain part of your screen, the software will automatically adjust the size for you. This feature was patented, so only those developers which Microsoft allowed could use this feature. That patent expired in 2024, and as such, the 2024 release of Apple's MacOS, called MacOS Sequoia, will also have this feature. 

Today, Windows enjoys an effectively unassailable position as the market leader for enterprise desktop machines in most countries around the world, including and especially the United States. Even though many "headless", or screen-less systems use Linux or FreeBSD as a foundation, Windows remains the primary Operating System that humans interface with today. In the business world, it is so well ingrained that some industries will find it nearly or entirely impossible to migrate away from Windows, should the need arise. This is because Windows excels at "reverse-compatibility," or the ability of a piece of technology to remain compatible with older or obsolete standards. Windows excels at this because some industries, such as the medical field, do not often replace their equipment, as it can be extremely expensive. Therefore, a new Operating Systme which does not support their existing equipment is typically a non-option. Therefore, Windows remains the dominant system across the business world, and will remain as such for the forseeable future.