The World Wide Web is based on unique numbers called IP addresses and every single device or site that is part of the Web contains this kind of an address. It would be very hard to remember to go to 18.104.22.168 to load a website though, so a much simpler structure was introduced in the 80s - domains. Every domain includes a primary part as well as an extension, for example domain.com or domain.co.uk. A wide range of extensions exist globally - part of them are assigned to countries, just like .co.uk in the aforementioned example, which is assigned to the United Kingdom, while others are generic, like .com or .net. Some extensions are available for registration by every entity and others have precise requirements - company registration, regional presence, etcetera. You are able to obtain a new domain name via a registrar firm like ours and if the extension supports domain name transfers, you're able to move an existing domain between registrars too.