.co is the Internet country code top-level domain (ccTLD) for Colombia. It is administered by the Los Andes University.
See also .com, as many countries allow registrants (usually companies) to have second-level domains usually of the form .co.xx, where xx is the ccTLD. The United Kingdom (.co.uk), New Zealand (.co.nz), Japan (.co.jp) and South Korea (.co.kr) are all examples.
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