How did the Enigma Machine work?

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I knew there were rotors in the Enigma machine, but this gave me so many more details. Could I build my own version after watching this? Maybe, but it's easier to just use computer software these days. Besides, the Enigma machine did eventually get cracked by the allied forces, so it wouldn't be secure even if you did build your own. It's still really interesting to see how complex it was.