Imagine you have a diary where you write down all your secrets and nobody else is supposed to see it. A keylogger is like a sneaky spy that can secretly watch and record everything you type on your computer, just like reading your diary.
When you type on your keyboard, the keylogger can see and save every button you press, like a secret little detective. It can record your usernames, passwords, credit card information and even personal messages that you type. It can do all of this without you knowing, and send all the information back to someone who wants to spy on you.
Keyloggers can be very dangerous because they let people see things they should not see, and it can be used to steal your money or identity. That's why it's important to always be careful and make sure your computer is protected from them.