CentOS is an abbreviation for Community Enterprise OS. This is one of the best Linux releases for servers and it is regarded as one of the most reliable and secure Operating Systems out there. CentOS is open-source software, which means that you'll be able to personalize 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 will not need to pay any license fees, meaning that the overall price that you will need to pay for a server making use of CentOS will be more affordable as compared to the price for a server working with an alternative OS. What makes CentOS unique among various other Linux releases is its huge developer society, that will help you get the reply to any kind of question or problem you have. Furthermore, each version that's released officially is supported for 10 years, that is is much longer than with any other OS. This means regular security and stability updates that will provide a great software environment for all of your web apps in the long run.