What computer-like machine did British code breakers create to decipher the Enigma?

Colossus was the groundbreaking machine developed by British codebreakers during World War II to decipher the encrypted messages produced by the German Enigma machine. It is recognized as one of the earliest forms of electronic computing and was specifically designed to handle the complexity of the code used in German communications.

Colossus utilized a series of vacuum tubes to perform calculations and process vast amounts of data rapidly. This technology allowed the codebreakers at Bletchley Park, including notable figures such as Alan Turing, to automate the process of finding the settings for the Enigma machine, significantly enhancing their ability to break the codes and gather intelligence critical to the war effort.

Other options do not represent the machine designed to decode Enigma. A generic "Decoder" lacks the specific historical significance or identity tied to Colossus, while the "Enigma Machine" was the device that needed decoding rather than something that performed the decoding itself. "Binary Analyzer" also does not accurately refer to any specific historical machine related to decoding the Enigma. The design and successful operation of Colossus marked a pivotal moment in computing history and codebreaking efforts, making it the clear choice among these options.