The Viet Cong existed because the average Vietnamese village dweller was unhappy with the Diem regime, which was seen as corrupt, controlled by the USA, and looking down on villagers
The Ho Chi Minh Trail was a network of routes passing through Laos, Cambodia, and into South Vietnam, used to supply the Viet Cong with people, weapons, ammunition, and other equipment
Provided political leadership structure through the NLF
Organised into quick-acting, disappearing three-man cells
Won local support through propaganda, social reforms, and living with villagers
Appealed to Vietnamese people with ideas of fighting the USA and its puppet government, ending injustice and poverty, and uniting Vietnam under a fair (communist) government