The Boeing 737, commonly referred to as the B737, is a narrow-body commercial jetliner designed and manufactured by Boeing. First introduced in 1968, it has become one of the best-selling aircraft in aviation history, with various models serving airlines around the world. The B737 is known for its efficiency, versatility, and ability to operate on short to medium-haul routes. The aircraft features a distinctive high-wing design and is typically powered by two turbofan engines mounted on the wings. Over the years, the B737 has undergone several upgrades and variations, including the B737 Next Generation and the B737 MAX, which offer improved fuel efficiency and advanced technology.