hosts (file) - Wikipedia
https://en.wikipedia.org/wiki/Hosts_(file)The hosts file is one of several system facilities that assists in addressing network nodes in a computer network. It is a common part of an operating system's Internet Protocol (IP) implementation, and serves the function of translating human-friendly hostnames into numeric protocol addresses, called IP addresses, that identify and locate a host in an IP network. In some operating systems, the contents of the hosts file is used preferentially to other name res…