A CentOS hostname is a unique name that identifies a CentOS system on a network. It is used to identify the system when connecting to it over the network, and it is also used to identify the system in log files and other diagnostic information.
There are a few different types of hostnames that can be used on a CentOS system. The most common type is a simple hostname, which consists of a single word or phrase. For example, “server1” or “web-server” are both valid simple hostnames.