An operating system communicates with the hardware and allows other programs to run. It is a vital component of the system software and usually application programs require it to function.

      types of Operating Systems:

      · Windows 7 and 8
 · iOS

      · Android

      · OS X

      · UNIX

      · LINUX

· Windows 7 and 8: are the latest Microsoft operating system which has been installed on all new Windows computers since the latter part of 2012. Windows 8 looks quite differrent from Windows 7.

· iOS: is a movile operating system. Originally unveiled in 2007 for the iPhone. 

· Android: designed primarily for touchscreen movile devices such as smartphones and tablet computers. 

· OS X: Is a series of unix-basedgraphical interface operating systems developed by Apple.

· Unix: multi-user computer operating system originally developed in 1969.

· Linux: assembled under the model of free and open source software development and distribution. Released on 5 October 1991.