A host, or website, on the Internet is identified by a host name, such as www.example.com . Host names are sometimes called domain names. Host names are mapped to IP addresses, but a host name and an IP address do not have a one-to-one relationship.
https://www.ibm.com/docs/en/cics-ts/5.3?topic=concepts-host-names#:~:text=A%20host%2C%20or%20website%2C%20on,one%2Dto%2Done%20relationship.