The World Wide Web is based on unique numbers known as IP addresses and every single unit or web site that is a part of the Web has this kind of an address. It would be very difficult to remember to go to 188.8.131.52 to open a website though, because of this a much easier structure was made in the 80s - domain names. Each and every domain includes a primary part as well as an extension, for example domain.com or domain.co.uk. A number of extensions exist worldwide - some of them are given to countries, just like .co.uk in the abovementioned example, which is given to the United Kingdom, while many others are generic, for instance .com or .net. Various extensions are available for registration by every entity and some others have specific requirements - company registration, regional presence, etc. You can get a new domain name through a registrar company like ours and if the extension allows transfers, you are able to move an existing domain name between registrars too.