NAFTA is an agreement between Canada, Mexico, and the United States that established a trilateral trade bloc and eliminated most trade barriers between the three countries. It was signed in 1992 and went into effect in 1994. NAFTA aims to promote cross-border trade and investment through reducing tariffs and facilitating the movement of goods and services. Some benefits include increased trade, market access, and incomes in all three countries, though its effects have been uneven.