There are many different types of extensions. The following are known as "generic top-level domains" (gTLD's):
- .com - Commercial businesses
- .net - Network organizations
- .org - Organizations
- .edu - Educational (post secondary) institutions
- .gov - Government agencies (US)
- .mil - Military (US)
- .aero - Aviation industry
- .asia - A regional domain for Asia
- .cat - Catalan language/culture
- .biz - Business usage
- .coop - Cooperatives
- .info - Informational sites
- .int - International organizations
- .jobs - Employment
- .mobi - Mobile devices
- .museum - Museums
- .name - Families and individuals
- .pro - Specific professions
- .tel - Telephone connectivity
- .travel - Travel industry
