Vietnam visa on arrival (called VOA) is the same type of visa that you will be picked visa stamp and visa sticker at Ha Noi, Da Nang or Ho Chi Minh International Airport.
This is more preferred way to apply for a visa online to enter Vietnam than the traditional way through the Vietnam embassy or consulate. It then cost a few minutes for getting visa stamp at the airport.
This way to is used for normal passport holder with purpose of tourist or business. The process is quite easy: You just need to fill in our “Online Application Form”, pay the service fee, get your “Visa approval letter” within the chosen processing time and pick up your visa at your destination international airport in Vietnam.