What is a chauffeur?

chauffeur is a person employed to drive a passenger motor vehicle, especially a luxury vehicle such as a large sedan or limousine. A woman employed to drive a passenger motor vehicle is a chauffeuse.

Originally, such drivers were often personal employees of the vehicle owner, but now in many cases specialist chauffeur service companies or individual drivers provide both driver and vehicle for hire, although there are service companies that just provide the driver.

https://en.wikipedia.org/wiki/Chauffeur