A tour guide (or tourist guide) provides assistance, information and cultural, historical and contemporary heritage interpretation to people on organized tours, individual clients, educational establishments, at religious and historical sites, museums, and at venues of other significant interest. They (normally) have a recognized national or regional tourist guide qualification.
A tour guide is used by people who come from distant places for sightseeing. He looks after his customer till they leave the city providing them with all kinds of comfort.
In general, he/she is a person to introduce the attractions, taking care of all services and customers while they are on the tour
Gives people tours?
Tour guides work in the travel industry their having a many travel agents, giving guided tours to groups of visitors. They are experts on the history of the location and offer their tour groups interesting or enlightening information about points of interest at nature attractions, historic sites, museums, scenic locations, and other travel destinations. Guides may give walking tours, bus tours, or even lead river tours on a boat. Often hired by visitors' bureaus or travel companies, tour guides are typically residents of the region in which they give tours.