Linux is an operating system (OS) similar to other OS, such as in Mac and Windows. There’s few differences like its execution format. But Linux have an application that can emulate other OS functionality.
It's an open source operating system, meaning it's free. And most of all of its application are also free (games, music, themes, program, etc). And I know everybody love free ^_^.
One good thing about Linux because it’s an open source, the source code of the OS are given for most of the programmer with knowledge about UNIX and how to customize Linux can make there own version of it. Another thing is about viruses, I hate virus and I think you hate it too. Linux OS have only few viruses that can interrupt its system.
And if you have some problem about Linux there are many forums for you to join and they will be happily answer your question.
