CentOS is short for Community Enterprise OS. This is one of the leading Linux releases for servers and it's regarded as being one of the most reliable and safe Operating Systems on the market. CentOS is open-source software, so you'll be able to personalize it in any way you see fit, adding and removing packages or updating the program code of any of them. It's also free to distribute and use, so you will not need to pay any license fees, which means that the total price that you will need to pay for a server running CentOS will be much lower than the price for a server running another OS. What makes CentOS unique among various other Linux distributions is its huge developer community, which will help you get the reply to any kind of question or problem you may have. What's more, each version which is released officially is supported for a decade, which is much longer than with any other operating system. This means ordinary protection and stability updates that provides a reliable software environment for all your web apps in the long run.