Yes, you’ll need to apply for a Visa before you enter Vietnam unless you’re are from a visa waiver country or transit visa waiver country, and you meet requirements for good character to enter Vietnam.
A Visa entitles the holder to travel to Vietnam and apply for entry and stay permission in a time frame. An immigration official at the port of entry determines the visa holder’s eligibility for admission in Vietnam.
The purpose of intend travel and other factors will determine what type of visa is required under Vietnam immigration law. As a applicant, you need to meet all requirements to receive the category of visa for which you are applying for.
Everyone who is eligible to enter the Vietnam though visa facilities until comes under Visa Expected Countries
The Immigration Department of Vietnam manages the visa process strictly but fairly in order to best protect the Vietnam. Travellers to the Vietnam is most welcomed and encouraged.