I want to provide you with what you are looking for, and I bet you where looking for a list of domain extensions. Right?

In this post, I have simply listed all of the domain extensions I can find, and what they are short for.

Here is the list of internet domain extensions:

Top Level Domains

gTLD   Domain Extension Meaning                      Notes

.aero air-transport industry Must verify eligibility for registration; only those in various categories of air-travel-related entities may register.
.asia Asia-Pacific region This is a TLD for companies, organizations, and individuals based in the region of Asia, Australia, and the Pacific.
.biz business This is an open TLD; any person or entity is permitted to register; however, registrations may be challenged later if they are not by commercial entities in accordance with the domain’s charter.
.cat Catalan This is a TLD for websites in the Catalan language or related to Catalan culture.
.com commercial This is an open TLD; any person or entity is permitted to register.

.coop cooperatives The .coop TLD is limited to cooperatives as defined by the Rochdale Principles.
.edu educational The .edu TLD is limited to institutions of learning (nearly all universally in the U.S. and increasingly overseas, e.g., Australia and China), such as 2 and 4-year colleges and universities.
.gov governmental The .gov TLD is limited to U.S. governmental entities and agencies (mostly but not exclusively federal).
.info information This is an open TLD; any person or entity is permitted to register.
.int international organizations The .int TLD is strictly limited to organizations, offices, and programs which are endorsed by a treaty between two or more nations.
.jobs companies The .jobs TLD is designed to be added after the names of established companies with jobs to advertise. At this time, owners of a “company.jobs” domain are not permitted to post jobs of third party employers.
.mil U.S. military The .mil TLD is limited to use by the U.S. military.
.mobi mobile devices Must be used for mobile-compatible sites in accordance with standards.
.museum museums Must be verified as a legitimate museum.
.name individuals, by name This is an open TLD; any person or entity is permitted to register; however, registrations may be challenged later if they are not by individuals (or the owners of fictional characters) in accordance with the domain’s charter.
.net network This is an open TLD; any person or entity is permitted to register.
.org organization This is an open TLD; any person or entity is permitted to register.
.pro professions Currently, .pro is reserved for licensed or certified lawyers, accountants, physicians and engineers in France, Canada, UK and the U.S. A professional seeking to register a .pro domain must provide their registrar with the appropriate credentials.
.tel Internet communication services
.travel travel and tourism industry related sites Must be verified as a legitimate travel-related entity.

However, these top level domain extensions aren’t always used for what they are meant for. People usually stick to the normal .com, but if it is occupied, then these extensions can be a great alternative.

In addition to that, many of the really specialized ones tend to get better rankings in the search engines, as the domain extensions are harder to obtain – Which tells the search engines that only serious people are allowed to use a certain domain extension. (For example the .pro – Which has to be a “proffessional”)

(Thanks to wikipedia.org for much of the information)