Explanation:

 The WTO was born out of the General Agreement on Tariffs and Trade (GATT), which was established in 1947. A series of trade negotiations, GATT rounds began at the end of World War II and were aimed at reducing tariffs for the facilitation of global trade on goods. The rationale for GATT was based on the Most Favored Nation (MFN) clause, which, when assigned to one country by another, gives the selected country privileged trading rights. As such, GATT aimed to help all countries obtain MFN-like status so that no single country would be at a trading advantage over others.
The WTO replaced GATT as the world's global trading body in 1995, and the current set of governing rules stems from the Uruguay Round of GATT negotiations, which took place throughout 1986-1994. The purpose of the WTO is to ensure that global trade commences smoothly, freely and predictably. The WTO creates and embodies the legal ground rules for global trade among member nations and thus offers a system for international commerce. The WTO aims to create economic peace and stability in the world through a multilateral system based on consenting member states (currently there are slightly more than 140 members) that have ratified the rules of the WTO in their individual countries as well. This means that WTO rules become a part of a country's domestic legal system. The rules, therefore, apply to local companies and nationals in the conduct of business in the international arena. If a company decides to invest in a foreign country, by, for example, setting up an office in that country, the rules of the WTO (and hence, a country's local laws) will govern how that can be done. Theoretically, if a country is a member to the WTO, its local laws cannot contradict WTO rules and regulations, which currently govern approximately 97% of all world trade.