Is a cover letter necessary when applying for a visa in Vientiane?

The necessity of a cover letter when applying for a work visa in Vientiane, particularly for self-employed individuals, is not a strict requirement but varies by case. Many applicants have opted to include a cover letter to explain their business and application purpose, although some reported that their letters were returned, suggesting that they may not be necessary. Including a cover letter may be more beneficial for e-Visa applications due to document limitations, as it can help clarify multiple documents submitted at once.