DNS (Domain Name System)

Steve says:

A Domain Name System translates human-readable names like www.mother.uk.net into the binary IP address that’s actually used to move data packets around. DNS services exist on private networks as well as the internet.

Doris says:

If you look up a name in the phone book, it will give you a number. With DNS when you look up a name, it will give you an IP address. It’s that simple.