CentOS is short for Community Enterprise OS. This is one of the best Linux distributions for servers and it is recognized as one of the most reliable and protected Operating Systems available. CentOS is open-source software, so you will be able to customize it in any way you see fit, adding and removing packages or modifying the program code of all of them. It is also free to distribute and use, so you will not have to pay any license fees, meaning that the overall price that you'll have to pay for a server running CentOS will be more affordable than the price for a server working with another OS. What makes CentOS unique among various other Linux releases is its huge developer society, that will help you discover the reply to any kind of question or problem you may have. Furthermore, each version that's released officially is supported for ten years, that is is a lot longer than with any alternative operating system. This means frequent protection and stability updates which will provide a reliable software environment for all your web applications in the long run.