Some countries, such as Canada and the United States, may require the visitor to include a letter of invitation with their travel visa application. A letter of invitation is a formal letter from the person you intend to visit stating that
they are inviting you to visit them in that country. Invitation letters help travel authorities vet potential visitors by making sure that a temporary visit is indeed the true nature of the visa request. Check with your intended destination’s
government website for details on what needs to be included in a such a letter.