A "trolley" is a wheeled vehicle that runs on tracks and is commonly used for public transportation in urban areas. It can be powered by electricity, often through overhead wires, or by other means. Trolleys are designed to carry passengers and can be found in cities around the world, providing an efficient way to navigate through busy streets. In addition to passenger trolleys, the term can also refer to a shopping cart used in grocery stores. These carts help customers transport their items while shopping. Both types of trolleys play important roles in their respective contexts, enhancing convenience and accessibility.