Definition: The top-level domain is the very last section of an Internet domain name, located after the last dot.
For example, the top-level domain (TLD) of pcsupport.about.com is .com.
A number of top-level domains exist, many of which you've probably seen before. Some of the more popular ones include .com, .net, .edu, .gov, and .org.
Also Known As: TLD (abbreviation)
Examples:
"When I was looking for a domain name to register for my company, I found that the one I wanted to use was already being used by someone else in the .com top-level domain. I checked to see if the same name was being used under .net and it was not so I registered for it right away before someone else could!"
