TLD and Definition by webopedia.com

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 

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