Cryptography
Cryptography is a way to keep secrets safe when we send them from one place to another. It's like when you want to send a message to your friend, but you don't want anyone else to be able to read it.
So, when we use cryptography, we take a message that we want to keep secret and we turn it into something that looks like a bunch of jumbled-up letters and numbers. This is called "encrypting" the message. Then, we send the encrypted message to the person we want to receive it.
When the person receives the encrypted message, they use a special key (kind of like a secret code) to turn the jumbled-up letters and numbers back into the original message. This is called "decrypting" the message.
By encrypting and decrypting messages, we can keep them safe from people who might try to read them without permission. This is important for things like sending private messages, keeping personal information safe, and making sure that important messages don't get intercepted by the wrong people.