TLD

Short for top-level domain, and refers to the suffix attached to Internet domain names. There are a limited number of predefined suffixes, and each one represent a top-level domain. Current top-level domains include:

com - commercial businesses; this is the most common TLD
gov - U.S. government agencies
edu - Educational institutions such as universities
org - Organizations (mostly nonprofit)
mil - Military
net - Network organizations
ca - Canada
th - Thailand