Canary trap

Okay, kiddo! Imagine you have a lot of friends but one of them is a secret spy. You want to find out who that spy is, but you don't want to make it too obvious. So, here's what you do: you make up a story and tell a different version of that story to each friend. Each version has one small detail that's different from the others. That's called a canary trap!

Now, if the secret spy tells anyone about the story, you'll know exactly who it is because they'll give away the wrong detail from the version they heard. Just like if a canary in a coal mine stops singing, it means there's something bad in the air - in this case, the wrong detail means someone leaked the story and gave themselves away as the spy.

Canary traps can be used by governments and businesses to find out who's leaking confidential information. It's like playing a game of telephone with a twist - seeing who changes the message along the way. Pretty cool, huh?