The bombe was an electromechanical device used by British cryptologists to help decipher German Enigma-machine-encrypted signals during World War II. The US Navy and US Army later produced machines to the same functional specification, but engineered differently.
The initial design of the bombe was produced in 1939 at the UK Government Code and Cypher School (GC&CS) at Bletchley Park by Alan Turing, with an important refinement devised in 1940 by Gordon Welchman. The engineering design and construction was the work of Harold Keen of the British Tabulating Machine Company. It was a substantial development from a device that had been designed in 1938 by Polish Cipher Bureau cryptologist Marian Rejewski, and known as the "cryptologic bomb" (Polish: "bomba kryptologiczna").
The bombe was designed to discover some of the daily settings of the Enigma machines on the various German military networks: specifically, the set of rotors in use and their positions in the machine; the rotor core start positions for the message—the message key—and one of the wirings of the plugboard.
Read more about Bombe: The Enigma Machine, The Principle of The Bombe, The British Bombe, Response To The Four-rotor Enigma