The World Wide Web employs unique numbers identified as IP addresses and each unit or web site that is a part of the Web has such an address. It would be pretty hard to remember to visit 18.104.22.168 to open a website though, so a much simpler structure was created in the 80s - domain names. Each domain name consists of a primary part plus an extension, for example domain.com or domain.co.uk. A great number of extensions exist globally - some of them are given to countries, such as .co.uk in the aforementioned example, which is assigned to the United Kingdom, while others are generic, for example .com or .net. Many extensions are available for registration by every entity and others have certain requirements - business registration, local presence, etcetera. You're able to acquire a brand new domain via a registrar company such as ours and when the extension allows transfers, you're able to transfer an existing domain between registrars too.