Top-level domain, the highest level in the hierarchical domain name system of the internet, such as .com or .org.
Modern English acronym from 1980s computer networking terminology, formed from 'top-level domain' as the internet's domain name system was developed by ARPANET researchers.
The humble TLD is like the postal code of the internet - .com was originally meant only for commercial entities, but became so popular it's now used by everyone from personal blogs to major corporations, making it the most valuable three letters in cyberspace.
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