Stands for "Time To Live." Pretty intense for a computer term, huh? It refers an aspect of the Internet Protocol. TTL is used when a "ping," or a request for a response, is sent to another computer, such as a server. The TTL represents the number of hops, or servers in different locations, the request can travel to before returning a failed attempt message.
This page contains a technical definiton of TTL. It explains in computing terminology what TTL means and is one of many Internet terms in the TechTerms dictionary.
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