The World Wide Web uses unique numbers known as IP addresses and each device or web site that is part of the Web contains such an address. It is very hard to remember to go to 220.127.116.11 to load a website though, that's why a much simpler system was made in the eighties - domain names. Each domain contains a main part plus an extension, for instance domain.com or domain.co.uk. A plethora of extensions exist worldwide - some of them are given to countries, for example .co.uk in the abovementioned example, which is assigned to the United Kingdom, while many others are generic, for instance .com or .net. Various extensions are available for registration by any entity and some others have certain requirements - business registration, local presence, etc. You're able to get a brand new domain via a registrar firm like ours and when the extension allows domain transfers, you will be able to move an existing domain between registrars too.