The World Wide Web is based on unique numbers identified as IP addresses and every unit or web site that is a part of the Web has such an address. It is very difficult to remember to visit 220.127.116.11 to see a website though, because of this a significantly simpler system was introduced in the 80s - domains. Every domain name includes a main part as well as an extension, to give an example domain.com or domain.co.uk. Many different extensions exist worldwide - some of them are given to countries, for example .co.uk in the aforementioned example, which is assigned to the United Kingdom, while others are generic, for instance .com or .net. Various extensions are available for registration by every entity and some others have certain requirements - business registration, regional presence, etcetera. You can obtain a new domain through a registrar company like ours and when the extension allows domain name transfers, you'll be able to shift an existing domain name between registrars too.