The Lisbon Metro is a rapid transit system serving the city of Lisbon, Portugal. It consists of four main lines—Blue, Yellow, Green, and Red—that connect various neighborhoods and key locations, including the city center and the airport. The system is known for its efficiency and affordability, making it a popular choice for both locals and tourists. Opened in 1959, the Lisbon Metro has expanded over the years and now includes 56 stations. It operates daily, with trains running frequently, ensuring convenient transportation across the city. The metro is an essential part of Lisbon's public transport network, complementing buses and trams.