Yep! You've pretty much nailed it. Cipher: exchanging letters to hide a message. Code: exchanging words/phrases to hide a message. Encryption: combining math

Yep! You've pretty much nailed it. Cipher: exchanging letters to hide a message. Code: exchanging words/phrases to hide a message. Encryption: combining math + ciphers (sometimes code too!) to hide a message. Codes are great for real people having fluent conversations, not so great for computers. We actually use "codes" all the time, but when they're used in large groups (and not a 'secret'), we call it "jargon." "Push it to main, and I'll pull it in to my buggy branch to see if that works" will make almost no sense to anyone but a programmer who works with git and even then, only someone who's used git since everyone renamed the 'master' branch to 'main.'