What does it mean “on-site tour guide”, “tour guide” and “tour escort/ tour leader”?

An on-site tour guide is the one who is just working at selected site, for example: the historical site of Cu Chi Tunnels or the Imperial Citadel of Hue, or one some cruise trips in Halong Bay (shared boat). A tour guide will take you on an excursion from 1 to a few days, away from the main cities. For example, a 2 day trip to Halong Bay or a three-day trip to Mai Chau, this guide will meet you from your hotel in Hanoi or Saigon… then be with you the whole trip till you finish your trip back to the city you base. The role of tour escort or tour leader, is to meet and greet you at the airport, and to travel with you during your whole trip. This is convenient for you because he / she will be all the time helping you with translations, tips and answering questions. This type of guide must be covered in the cost of your tour by your group.