A TLD, or Top Level Domain, is the name for the affix to the end of your domain name. There are several TLDs, the most common being .com, .net, and .org, and each one has a specific meaning which signifies the type of web site. Also, there are now Top Level Domains for countries, such as .uk, .ca, .ru, and so on. Before domain names were available, the way to access a network or website was to use its Internet Protocol address, which is a set of numbers separated by dots like 192.168.1.1, but it was difficult for a user to remember all of the number-sets.