.CO is the country code top-level domain (ccTLD) assigned to Colombia.
The TLD was Introduced 1991 and through a public procurement process in 2009 .CO Internet S.A.S from Bogotá, Colombia had become its registry.
Any individual or entity in the world can register a .co domain name, with no restrictions;
the TLD has become extremely popular among established brands for search engines, social websites and more, even some with no relation to Colombia.