".com" is a commercial internet Top Level Domain (TLD). This is an open TLD, meaning that any person or entity is permitted to register.
Although ".com" was originally meant for commercial websites, it's now used by practically anytype of website except "official" websites. For more information, see:
http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
The abbreviation at the end of Irish domain names is ie. Anyone applying for an ie domain name who does not reside in the 32 counties of Ireland must prove a Real and Substantive Connection with Ireland.
A domain extension is the end of a domain. For example, in the domain [ example.com ], "com" is the extension.
Sunpu Domain ended in 1871.
Tsuyama Domain ended in 1871.
Sanuki Domain ended in 1871.
Shimotsuma Domain ended in 1871.
Nagao Domain ended in 1871.
Takasu Domain ended in 1870.
Sagara Domain ended in 1868.
Ichinomiya Domain ended in 1871.
Koga Domain ended in 1871.
Tahara Domain ended in 1871.