CentOS is an abbreviation for Community Enterprise OS. This is one of the best Linux releases for servers and it is well known as one of the most reliable and safe Operating Systems available. CentOS is open-source software, so you are able to customize it in any way you see fit, adding and removing packages or updating the program code of all of them. It's also free to distribute and use, so you will not have to pay any kind of license fees, meaning that the overall price that you will need to pay for a server running CentOS will be lower than the price for a server running some other OS. What makes CentOS stand out among other Linux releases is its huge developer community, that will help you get the answer to any question or problem you might have. What's even more, each version that's released officially is supported for ten years, that is is longer than with any other OS. What this means is regular security and stability updates that will provide a stable software environment for your web applications in the long run.