The Chicago Transit Authority (CTA) is the agency responsible for public transportation in the city of Chicago and some surrounding suburbs. It operates an extensive network of buses and trains, known as the L (short for "elevated"), providing residents and visitors with convenient access to various neighborhoods and attractions. Founded in 1947, the CTA aims to offer safe, reliable, and efficient transit services. The system includes multiple train lines and hundreds of bus routes, making it one of the largest public transportation networks in the United States. The CTA plays a crucial role in reducing traffic congestion and promoting sustainable urban mobility.