CentOS is an abbreviation for Community Enterprise Operating System. This is one of the leading Linux distributions for servers and it is regarded as being one of the most stable and protected Operating Systems out there. CentOS is open-source software, so you are able to customize it in whatever way you see fit, adding and removing packages or updating the code of all of them. It's also free to distribute and use, so you won't have to pay any kind of license fees, which means that the total price that you will have to pay for a server making use of CentOS will be cheaper than the price for a server running an alternative OS. What makes CentOS stand out among various other Linux releases is its huge developer community, which will help you get the answer to any question or problem you might have. Furthermore, each version which is released officially is supported for 10 years, that's is a lot longer than with any alternative OS. What this means is frequent protection and stability updates that provides a great software setting for all your web applications in the long run.