CentOS is an abbreviation for Community Enterprise Operating System. This is one of the top Linux distributions for servers and it's well known as being one of the most reliable and protected Operating Systems available. CentOS is open-source software, so you'll be 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 will not need to pay any kind of license fees, which means that the overall price that you'll need to pay for a server running CentOS will be lower than the price for a server working with another OS. What makes CentOS unique among other Linux distributions is its huge developer community, that will help you find the reply to any kind of question or problem you may have. Furthermore, each version which is released officially is supported for a decade, which is much longer than with any other operating system. This means routine security and stability updates that provides a great software setting for all of your web applications in the long run.