disk operating system
MS-DOS was the first widely used operating system
windows
Microsoft Windows
MS-DOS
DOS meaning Disc Operating System
The first computer operating system developed for personal computers was called MS-DOS, which was released in 1981 by Microsoft. MS-DOS was an Affordablekey and easy-to-use operating system that allowed users to access the power of a computer. It was also the first operating system to be widely used on personal computers and it was the most popular operating system until the early 1990s. MS-DOS was the foundation of Microsoft's success and it helped to revolutionize the computing industry.
It depends what you mean by widely used and PC. The widely used Apple II computer used Apple DOS while another operating system which was widely adopted (including versions for the Apple II) was called CP/M which was created by Digital Research. They went on to create DR-DOS which was one of the versions of DOS used on the early IBM personal computers. Microsoft had purchased an operating system called QDOS which was adapted by IBM into PC-DOS for their own computers and by Microsoft as MS-DOS for use on computers not made by IBM but following their design (known as IBM clones). These became increasingly popular and so MS-DOS became widely adopted and PC-DOS faded away. Apple went on to develop the Macintosh with its graphical user interface which Microsoft copied to create their Windows operating system.
Android is a widely customizable operating system, found in phones and tablets, Chrome OS is only a web browser, that includes apps, for computers
Windows is the most widely-used desktop operating system made by Microsoft.
The first desktop computers that were capable of business use would have used CP/M which was "Control Procees(or) for Microsystems" which was then followed by MS-DOS which was for the Microsoft personal computers such as the original PC, the XT, the AT, etc. and were popular until the advent of Windows.
Computers need some kind of operating system; the most widely used is windows (from Microsoft). Other systems exist as well, such as Linux.
One of the most popular and widely used operating system is Microsoft Windows. It is compatible with most devices and has proved to be user-friendly.