CentOS is short for Community Enterprise Operating System. This is one of the leading Linux distributions for servers and it is recognized as one of the most reliable and safe Operating Systems available. CentOS is open-source software, so you'll be able to customize it in any way you see fit, adding and removing packages or altering the program code of any of them. It's also free to distribute and use, so you won't have to pay any license fees, meaning that the overall price that you will have to pay for a server making use of CentOS will be much lower as compared to the price for a server running another OS. What makes CentOS stand out among other Linux releases is its huge developer society, which will help you get the answer to any question or problem you may have. Furthermore, each version that's released officially is supported for ten years, that's is longer than with any other operating system. What this means is regular safety and stability updates which will provide a reliable software setting for all your web apps in the long run.