CentOS is an abbreviation for Community Enterprise OS. This is one of the top Linux releases for servers and it's recognized as being one of the most reliable and safe Operating Systems out there. CentOS is open-source software, so you are able to customize it in whatever way you see fit, adding and removing packages or altering the program code of all of them. It's also free to distribute and use, so you will not have to pay any license fees, which means that the total price that you'll need to pay for a server making use of CentOS will be lower as compared to the price for a server running some other OS. What makes CentOS unique among various other Linux releases is its huge developer society, that will help you find the reply to any question or problem you have. Furthermore, each version which is released officially is supported for ten years, that is is much longer than with any alternative OS. What this means is regular safety and stability updates which will provide a stable software setting for all your web apps in the long run.