CentOS is one of the most widely used Operating Systems for hosting servers. It's one of the numerous Linux releases out there, however what differentiates it from all the others is the long-term support, which guarantees that you'll always have a stable and protected OS. Every CentOS version that is released is supported for ten years, that's a lot longer than with any other OS available on the market. CentOS also has a much larger developer community than other distributions, therefore if you encounter any kind of problem or have some questions, you are able to rapidly find the info which you need. CentOS is widely known as among the best server Operating Systems, since it is very stable and secure, that makes it really reliable even when you host confidential info. Because it is open-source, you can modify every part of it and customize it according to your needs, not to mention that the overall cost for a CentOS-based server will be lower, since you will not need to pay license fees of any type.