Oh my goodness, think of the five year-olds!
Say you want to pass a note to your friend Bob in class.
Before class, you talk to Bob and you make up a secret code. It’s like as special language that only you and Bob understand. You and Bob know the code, but nobody else knows it, not even your teacher.
After class starts, you can write down, “Q wqdt ftfftmusq fqhhr”, and pass it to Bob. When he opens up the note, he knows it secretly means “I like pepperoni pizza”.
But if your teacher or one of your classmates grabs the note, the can’t read it, because they don’t know the secret code! They can look at it all day, but they will never understand what it really means.
Only you and Bob can understand it, because only you and Bob know the secret code.
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