CentOS is an abbreviation for Community Enterprise OS. This is one of the top Linux distributions for servers and it's well known as one of the most stable and safe Operating Systems out there. CentOS is open-source software, so you are able to customize it in any way you see fit, adding and removing packages or modifying the program code of any of them. It's also free to distribute and use, so you won't need to pay any kind of license fees, which means that the total price that you will have to pay for a server making use of CentOS will be lower than the price for a server running an alternative OS. What makes CentOS stand out among other Linux releases is its huge developer society, which will help you get the reply to any question or problem you have. What's more, each version which is released officially is supported for 10 years, that is is much longer than with any alternative OS. This means routine protection and stability updates which provides a stable software environment for all of your web applications in the long run.