Letters of invitation (LOIs) are documents issued by the Ministry of Foreign Affairs, an agency, company or national of that particular country inviting you to visit the country for a period of time.
Some countries have more relaxed rules about the LOIs than others. For instance, Turkmenistan LOIs must be issued by the Ministry of Foreign Affairs (MFA) while the ones for China can be written by a travel agency or even your friend if they live in China.
In the cases where it’s the MFA issuing the LOI, the application process may take weeks, so it’s recommended to check the requirements well in advance of your trip.
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