A domain or domain name is an unique identifier for an entity such as a business, person or computer that wants to have an address on the Internet. As addresses on the Internet are long difficult to remember numbers, and are likely to change now and then anyway, the Internet has a system where you can ask for an unused domain name to be assigned to you.

The domain name is, of course, of no use unless it is mapped to an Internet address. So, you also need to arrange for your ISP or web host provider to assign you an Internet - or Internet protocol (IP)- address that can be linked to your domain name. To allow data to be send to you, you need to make sure that others on the Internet can translate your domain name into your IP address by listing your domain name in the Internet's equivalent of the telephone book, the Domain Name System (DNS).

More on domain names and the Domain Name System here

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