Country code top-level domain

A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country or a dependent territory. ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs. Creation and delegation of ccTLDs is performed by the Internet Assigned Numbers Authority (IANA), and with certain exceptions noted below corresponds to the ISO 3166-1 alpha-2 country codes maintained by the ISO 3166 Maintenance Agency.
See more at Wikipedia.org...