CentOS is one of the most widely used Operating Systems for hosting servers. It's one of the many Linux releases out there, however what differentiates it from all of the rest is its long-term support, which guarantees that you will always have a stable and risk-free OS. Each CentOS version that is released is supported for 10 years, that's a lot longer than with another OS out there. CentOS also has a much larger developer community than other distributions, therefore in case you encounter any problem or have some questions, you are able to instantly get the data which you need. CentOS is considered to be among the best server Operating Systems, since it's very stable and secure, that makes it really reliable even if you host confidential information. Since it is open-source, you can modify every part of it and customize it according to your needs, not to mention that the total cost for a CentOS-based server will be lower, since you will not have to pay license fees of any sort.