The Boeing B-17 is a four-engine heavy bomber developed by the Boeing Company in the 1930s. It played a significant role during World War II, primarily in the European theater, where it was used for strategic bombing missions. Known for its durability and ability to sustain heavy damage, the B-17 earned the nickname "Flying Fortress." Equipped with advanced technology for its time, the B-17 featured a distinctive boxy shape and multiple gun positions for defense against enemy fighters. Over 12,000 units were built, and it became an iconic symbol of American air power during the war.