What is international registration of a mark? What is global trademark?

An International Registration allows trademark owners to register their trademarks with a single, uniform application through a centralized filing system with the ability to designate multiple countries (contracting parties). The system for international trademark registration is referred to as the Madrid System for the International Registration of Marks and is governed by the Madrid Agreement, and the Madrid Protocol. To understand more about International Registration of mark refer to - What countries are members of Madrid system allowing the international system for trademark registration?