CentOS is short for Community Enterprise OS. This is one of the leading Linux releases for servers and it's well known as being one of the most reliable and secure Operating Systems available. CentOS is open-source software, so you will be able to customize it in any way you see fit, adding and removing packages or modifying the program code of all of them. It is also free to distribute and use, so you won't have to pay any kind of license fees, which means that the overall price that you'll have to pay for a server running CentOS will be much lower than the price for a server running some other OS. What makes CentOS stand out among other Linux releases is its huge developer society, which will help you discover the answer to any kind of question or problem you have. What's more, each version which is released officially is supported for 10 years, that's is much longer than with any alternative OS. This means routine security and stability updates that will provide a stable software setting for all of your web apps in the long run.