you have an address: city, street number... you could give to people the gps coordinates for it, latitude and longitude, but it's easier to use the address.

In the same way, computers on the internet have an ip address, such as 192.168.1.1, but it's easier to use a domain such as hello.com

DNS is the service translating between domains and ip addresses. Since it can store some information, it's also used to verify things for example for emails.