CentOS is an abbreviation for Community Enterprise Operating System. This is one of the best Linux distributions for servers and it is well known as one of the most stable and protected Operating Systems on the market. CentOS is open-source software, so you're able to customize it in whatever 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'll need to pay for a server making use of CentOS will be cheaper than the price for a server working with an alternative OS. What makes CentOS unique among other Linux releases is its huge developer society, that will help you find the reply to any kind of question or problem you may have. Furthermore, each version that is released officially is supported for 10 years, that is is longer than with any other operating system. What this means is regular safety and stability updates which will provide a reliable software environment for all your web applications in the long run.