A Metro System is a rapid transit system that operates in urban areas, providing efficient transportation for commuters. It typically consists of underground or elevated trains that run on fixed routes, allowing passengers to travel quickly between different parts of a city. Metro systems are designed to reduce traffic congestion and promote public transport use. Most metro systems have multiple lines, each identified by a unique color or number, and they stop at various stations. Passengers can purchase tickets or use smart cards to access the system. Major cities around the world, such as New York City, London, and Tokyo, have well-developed metro systems that serve millions of riders daily.