A trolley is a wheeled vehicle designed for transporting goods or passengers. It can be found in various forms, such as shopping trolleys used in supermarkets or streetcars that run on tracks in urban areas. Trolleys are typically pushed or pulled and are often made of metal or plastic. In public transportation, a trolley refers to a streetcar that operates on tracks and is powered by electricity. These trolleys are common in cities and provide an efficient way for people to travel. They are often associated with public transit systems and contribute to reducing traffic congestion.