The country code top-level domain (ccTLD) is a code top-level domain extension that maps to each country. Put more simply, on the Internet, every web page has an address. Well, the termination of this address is called the top-level domain. Thus, each country has its own domain extension that is based on ISO 3166 codes. For example, for Spain it would be “.es”, for the United Kingdom: “.uk”)
The assignment of each ccTLD domain is carried out by the Internet Corporation for Assigned Names and Numbers (ICANN).