Below is the sample of Vietnam Visa Approval letter or pre-approved letter.
To get this letter, you – the visa applicant is required to submit a Vietnam Visa application online. All your information will be sent to Vietnam Immigration Department for checking and approving. Then the Visa approval letter will be published.
You have this letter, it means you are allowed to enter Vietnam for a specific time and your Vietnam Visa will be issued at Vietnam airports.
This letter will be sent to you by email. You just need to print it out and use it for boarding at your departure. Use it again to get the Visa into your passport when you arrive Vietnam airport.