The international trademark is part of a trademark registration system for countries belonging to the Madrid System, and it includes two international treaties: the Madrid Agreement and the Madrid Protocol.
It is not a trademark that can be registered throughout the world, but only in the countries that belong to the Madrid System. There are currently 80 that either form part of the Agreement, the Protocol or both. A trademark may also be applied for protection in the European Union (see the list of member countries on the WIPO page: http://www.wipo.int/madrid/es/members/index.html). The system cannot be used to protect the trademark in other non-member countries.