For sure you have a phone and contact number. To contact people or get people to contact you, you need their phone number or give your phone number and store it in the contact list.
Think of the Domain Name System or DNS as the equivalent of a phone’s contact list. It stores the IP addresses that tell your browser where to send queries for a web page to show or send/receive emails.
DNS Hosting connects a domain name to the web and email hosting server to keep services online.