Generic Top-Level Domain
Atop-level domain used (at least in theory) by a particular class of organization.
These are three or more letters long, and are named for the type of organization that they represent (for example, .com for commercial organizations).
The following gTLDs currently exist (as does .arpa, which is sometimes considered a gTLD):
.aero – for the air transport industry
.biz – for business use
.cat – for Catalan language/culture
.com – for commercial organizations, but unrestricted
.coop – for cooperatives
.edu – for post-secondary educational establishments
.gov – for governments and their agencies in the United States
.info – for informational sites, but unrestricted
.int – for international organizations established by treaty
.jobs – for employment-related sites
.mil – for the US military
.mobi – for sites catering to mobile devices
.museum – for museums
.name – for families and individuals
.net – originally for network infrastructures, now unrestricted
.org – originally for organizations not clearly falling within the other gTLDs, now unrestricted
.pro – for certain professions
.travel – for travel agents, airlines, hoteliers, tourism bureaus, etc.