A "cab" is a type of vehicle used for public transportation, commonly known as a taxi. Cabs are typically driven by a professional driver and can be hailed on the street or booked through a phone app. They provide a convenient way for passengers to travel from one location to another, often charging a fare based on distance and time. Cabs are often marked with a distinctive sign on the roof and may have a meter to calculate the fare. In many cities, cabs are regulated by local governments to ensure safety and fair pricing. Some popular cab services include Uber and Lyft.