Linux

    Linux. Most people when they hear Linux, they will ask what is Linux. Linux is UNIX like operating system, it is free and open source. Some people will ask isn't all the operating system free? The answer is no, when you buy your PC or Mac the operating system is pre-installed on your computer already. However, it does not mean that it is free, you actually have to pay a license fee, which is included when you purchase your computer.  But Linux is free, if you have the way to get a UNIX CD you could just install it on your computer, or you could just download it of the Internet. Another question is what is open source? open source means that anyone are allow to modify Linux, after you modify it you could even sell it.

    There is not really an operating system call Linux, Linux have many distributions, there are some Linux popular Linux distribution  redhat, fedora,  backtrack, uduntu, Mint. Different Linux distribution are good at doing different things, for example backtrack is good at penetrating people's Internet.
Linux could pretty much do anything you want to do with a computer, but there is also a down side to that, if you are a gamer, you probably will not want to use Linux. Linux does not support many fancy games. But overall Linux is a operating system worth checking out.