The WTO was established in 1995 to oversee international trade agreements and liberalize trade. It replaced the General Agreement on Tariffs and Trade (GATT) which was formed after WWII to reduce tariffs and promote cooperation. The WTO operates as a forum for negotiating trade agreements, settling disputes, and reviewing national trade policies according to principles like non-discrimination and transparency. It has 157 member countries and aims to help trade flow freely, fairly, and predictably globally.