CentOS is short for Community Enterprise Operating System. This is one of the best Linux distributions for servers and it's recognized as one of the most reliable and safe Operating Systems on the market. CentOS is open-source software, so you can customize it in any way you see fit, adding and removing packages or modifying the code of any of them. It's also free to distribute and use, so you will not need to pay any license fees, meaning that the total price that you'll have to pay for a server making use of CentOS will be lower than the price for a server working with another OS. What makes CentOS unique among various other Linux releases is its huge developer community, which will help you get the reply to any kind of question or problem you might have. Furthermore, each version which is released officially is supported for ten years, that's is a lot longer than with any other operating system. What this means is regular protection and stability updates which will provide a stable software setting for all your web applications in the long run.