CentOS is short for Community Enterprise OS. This is one of the leading Linux releases for servers and it is well known as being one of the most dependable and safe Operating Systems available. CentOS is open-source software, which means that you'll be able to customize it in any way you see fit, adding and removing packages or updating the program code of any of them. It is also free to distribute and use, so you will not need to pay any kind of license fees, meaning that the total price that you'll have to pay for a server running CentOS will be more affordable than 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 get the answer to any kind of question or problem you have. Furthermore, each version which is released officially is supported for ten years, which is a lot longer than with any other OS. What this means is frequent security and stability updates which will provide a stable software environment for all your web applications in the long run.