TLD

Top-Level Domains (TLDs) are the last term in a website address or URL. "There are two types of top-level domains, generic and country code, plus a special top-level domain (.arpa) for Internet infrastructure. Generic domains were created for use by the Internet public, while country code domains were created to be used by individual countries as they deemed necessary." (from the IANA site)

References:

• IANA: Domain Name Services http://www.iana.org/domain-names.htm
• Wikipedia
  • (EN) "Top-level domain," http://en.wikipedia.org/wiki/Top-level_domain
  • (FR) "Domaine de premier niveau," http://fr.wikipedia.org/wiki/Domaine_de_premier_niveau
  • (PT) "Domínio de topo," http://pt.wikipedia.org/wiki/Dom%C3%ADnio_de_topo

Generic TLDs (gTLDs)

Generic TLDs include .aero, .biz, .cat, .com, .coop, .edu, .gov, .info, .jobs, .mobi, .int, .mil, .museum, .name, .net, .org, .pro, .tel and .travel

References:

• IANA: Generic Top-Level Domains http://www.iana.org/gtld/gtld.htm
• Wikipedia
• ICANN: Top-Level Domains (gTLDs) http://www.icann.org/tlds/
  • (EN) "Generic top-level domain," http://en.wikipedia.org/wiki/Generic_top-level_domain
  • (FR) "Domaine de premier niveau," http://fr.wikipedia.org/wiki/Domaine_de_premier_niveau
  • (PT) "Domínio de topo," http://pt.wikipedia.org/wiki/Dom%C3%ADnio_de_topo

Country-Code Top-Level Domains (ccTLDs)

Country-code TLDs are each two letters, using the codes in ISO-3166-1.

References:

• IANA: Country-Code Top-Level Domains http://www.iana.org/cctld/
• Wikipedia
  • (EN) "Country code top-level domain," http://en.wikipedia.org/wiki/Country_code_top-level_domain