The Vietnam Immigration Department issues visa approval letters, which permit visitors to enter and leave the country within a specified time frame. You can pick up your visa and get it stamped in your passport when you arrive in Vietnam by presenting the visa acceptance letter to immigration officials at the airport. Also, passengers should ensure that their application has accurate information before submitting it, as the relevant authorities will check the information on the approval letter using your passport and travel papers. They won't allow you to board the plane if your personal information is entered incorrectly.
In short, it serves as a formal authorization allowing its owner(s) to go to Vietnam and obtain a visa stamp once they arrive at the airport in Vietnam. Please remember that the Visa approval letter is only a necessary document to obtain a Vietnam visa on arrival and is not a visa.
The Vietnam visa approval letter includes the following:
A declaration authorizing the holder(s) to access Vietnam and receive a visa stamp upon arrival at a Vietnamese airport.
Specifics regarding individuals granted entry into Vietnam using this document encompassing complete name, passport ID, birthdate, and nationality.
Permitted duration to stay in Vietnam.
The digital signature of the Vietnam Immigration Department (distinct from the previous red stamp method).