TLD or Top Level Domain is a term that refers to the most commonly used domain name extensions in use on the internet. Examples of TLD’s include .com, .net and .org which were some of the earliest adopted TLD’s. These are also considered to be “root domains” which are installed at the root level of the domain name space. The Internet Corporation for Assigned Names and Numbers (ICANN) assigns responsibility of management of TLD’s to specific organizations.
TLD’s have expanded from the original three designations of Country, Category and Multi-organizations and now includes a great many for various uses. New TLD’s are proposed to ICAAN all the time and they need to survive a vote in order to be approved and added to the slowly expanding list.
For most internet users, using a TLD is second nature and requires no background knowledge at all. When a website owner registers a domain to host on a server, they are given the option to purchase several different versions to reside on the various TLD’s. The most common TLD by far is .com and is considered to be the best TLD on which to host a general website.