CentOS is one of the most widely used Operating Systems for web hosting servers. It's one of the countless Linux releases available, but what differentiates it from all of the others is its long-term support, which guarantees that you'll always have a stable and safe OS. Every CentOS version that is released is supported for 10 years, which is much longer than with almost every other OS on the market. CentOS also has a much larger developer community than other distributions, therefore in the event you experience any problem or have any questions, you will be able to instantly discover the data which you need. CentOS is widely known as among the best server Operating Systems, because it's very stable and secure, which makes it very reliable even when you host confidential information. Considering that it is open-source, you will 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 type.