Trolleys are wheeled vehicles designed for transporting goods or people. They can be found in various forms, such as shopping trolleys used in supermarkets, luggage trolleys at airports, or streetcars that run on tracks in urban areas. Trolleys are typically made of metal or plastic and feature a handle for easy maneuvering. In public transportation, trolleys, often referred to as trams or streetcars, operate on fixed routes and provide an efficient way for passengers to travel within cities. They are powered by electricity, usually supplied through overhead wires, and are an eco-friendly alternative to cars, helping to reduce traffic congestion and pollution.