What are secret codes like invisible messages?

Secret codes are like invisible messages hiding inside regular letters or numbers, you just need a special way to see them.

Imagine you and your friend have a shared secret language, like a special way of writing that only the two of you understand. It's like when you use shorthand to write notes in class, but even more sneaky!

You can think of secret codes as hiding messages inside something else, like putting a toy inside a box. If you know how to open the box, you can find the toy.

For example, if your friend writes "I love ice cream", but they use a code where each letter is shifted by one (A becomes B, B becomes C, and so on), it would look like "J mwnf jdfd bnep". It seems normal at first, but with the right clue, like shifting letters backward, you can read the real message!

It’s like playing a game of hide-and-seek with messages! You write something that looks normal, but only someone who knows the trick can see the hidden message inside. And that makes it feel like you're sharing a little secret, just between you and your friend!