Aerogrammes are a type of lightweight and affordable postal service for sending letters and messages across international borders. Some synonyms for the word aerogrammes include airletters, airmails and air postcards. These terms refer to the same type of mail service, but may be used interchangeably depending on the context and regional preferences. Other related terms in this category include envelope mail, electronic mail, and express mail. Regardless of the term used, aerogrammes continue to be an important way to keep in touch with friends and family all over the world in a cost-effective manner.