The Ho Chi Minh Trail was made by Ho Chi Minh. This was used by the North Vietnamese to transport supplies to the Vietcongs in South Vietnam. This ran through Laos an Cambodia to not interfere with South Vietnam. Furthermore, this helped North Vietnam win.
As many found out that the North Vietnamese made a trail to supply weapons and other things to Vietcong, the American troops tried to destroy it. Although they thought they found it, the North Vietnamese had 50 miles of fake trails to trick them. But over time it was being taken to pieces. http://www.historylearningsite.co.uk/ho_chi_minh_trail.htm