What is a residence card in Vietnam and how can one obtain it?

A residence card in Vietnam is a document that allows foreign citizens to live and work in Vietnam for an extended period. To obtain it, one usually needs to meet specific eligibility criteria, such as already holding a valid visa. For someone applying for a Non-B visa in Vietnam, like your friend, it seems necessary to have a residence card if they're considering a multiple-entry visa. It is suggested that he apply for a 90-day single-entry visa, especially as a Kenyan passport holder in Vietnam.