NOOBS is a system designed by the Raspberry Pi foundation for installing operating systems onto your Raspberry Pi’s SD card. Not only are you able to install an operating system with a single click, but you can install it over a network or even install multiple operating systems on multiple partitions.
Now that you have a Raspberry Pi and want to set it up with an operating system (need to buy a Raspberry Pi? Get one on Amazon), you have several choices. If you’re primarily using the Raspberry Pi as a media center, you may want to consider installing RaspBMC, a custom distribution of XBMC. This will allow your Raspberry Pi to boot directly into a media center interface.
But if you’re looking to use your Raspberry Pi as a general computer, you may want to consider the Raspbian distribution. Raspbian is a version of Debian Linux specifically configured to run on the Raspberry Pi and is recommended by the Raspberry Pi Foundation as the operating system to install.