What is Windows?

Windows is Microsoft's operating system, or OS. It has been around a long time and is used by most people running PCs (personal computers). There is also a Windows OS for the Mac. An OS, to put it simply, tells your computer how to respond to commands. Some people confuse an OS with a browser. The browser is the software you use to "surf" the internet. The two most popular browsers are Microsoft's Internet Explorer, and Firefox.