CentOS is one of the most widely used Operating Systems for website hosting servers. It's one of the countless Linux distributions in existence, however what differentiates it from all of the others is the long-term support, which ensures that you'll always have a stable and secure OS. Every CentOS version that is released is supported for a decade, that's a lot longer than with almost every other OS available on the market. CentOS also has a much larger developer community than other distributions, therefore in case you experience any kind of problem or have any questions, you'll be able to quickly find the info that you need. CentOS is widely known as one of the best server Operating Systems, because it's very stable and secure, that makes it really reliable even if you host sensitive data. Considering that it is open-source, you're able to 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, because you will not need to pay license fees of any type.