CentOS is an abbreviation for Community Enterprise Operating System. This is one of the best Linux distributions for servers and it is recognized as one of the most stable and secure Operating Systems out there. CentOS is open-source software, so you can customize it in whatever way you see fit, adding and removing packages or modifying the program code of any of them. It is also free to distribute and use, so you won't need to pay any kind of license fees, meaning that the overall price that you'll have to pay for a server making use of CentOS will be cheaper than the price for a server working with another OS. What makes CentOS stand out among various other Linux distributions is its huge developer society, which will help you get the answer to any kind of question or problem you have. Furthermore, each version that's released officially is supported for a decade, that's is a lot longer than with any other operating system. What this means is frequent security and stability updates that provides a stable software setting for all your web apps in the long run.