Computer software is a product developed by a software engineer. It is a combination of program and document.
When you buy software, it contains documents and programs. For example, even if we buy a calculator, we may notice that it comes with a catalog with a calculator.
There are two main types of software.
1. Operating System Software (OS)
2. Application Software
Most people know the operating system as a window. This is due in large part to the success of the Microsoft platform. There are other operating systems on the Linux platform (Fedora, Ubuntu..etc), Solaris, and Macintosh (OS X). There are two types of operating systems. DOS (Desktop Operating System eg; Windows XP, Windows Vista, Windows 7, Ubuntu). And operating systems such as NOS (Network Operating System eg; Windows 2003 Server).