CentOS is one of the most widely used Operating Systems for web hosting servers. It's one of the many Linux releases in existence, however what differentiates it from all of the others is the long-term support, which ensures that you'll always have a reliable and safe OS. Each CentOS version that is released is supported for a decade, that is considerably longer than with any other OS available on the market. CentOS also has a much larger developer community than other distributions, so if you encounter any problem or have some questions, you will be able to instantly find the data which you need. CentOS is widely known as among the best server Operating Systems, as it's very stable and protected, which makes it really reliable even if you host confidential data. Considering that it is open-source, you'll be able to modify any part of it and customize it according to your requirements, not to mention that the total cost for a CentOS-based server will be lower, as you won't have to pay license fees of any sort.