CentOS is short for Community Enterprise OS. This is one of the best Linux releases for servers and it's well known as being one of the most reliable and safe Operating Systems out there. CentOS is open-source software, so you're able to customize it in any way you see fit, adding and removing packages or altering the code of all of them. It is also free to distribute and use, so you will not have to pay any kind of license fees, which means that the overall price that you'll have to pay for a server making use of CentOS will be much lower as compared to the price for a server running another OS. What makes CentOS unique among other Linux releases is its huge developer community, that will help you discover the reply to any question or problem you might have. What's more, each version which is released officially is supported for a decade, that is is longer than with any alternative operating system. This means routine protection and stability updates which will provide a great software environment for all your web apps in the long run.