Okay kiddo, so open source Tripwire is like a secret agent that helps keep your computer safe from bad guys. It's like having a guard dog that watches over your computer and barks if it senses something suspicious.
Tripwire checks all the important files on your computer and takes a snapshot of what they look like. It then keeps watch for any changes that might happen to those files, like if someone sneaks in and tries to change them. If it sees anything strange, it'll let you know right away so you can take action to stop the bad guys.
Open source Tripwire is like a guard dog that everyone can use for free because it's not secret - anyone can see the code that makes it work and make improvements or changes to it. That means there are lots of smart people out there who can help make it even better at keeping your computer safe. It's kind of like a secret club where you help each other out to stay safe from the bad guys.
So that's what open source Tripwire is all about - keeping your computer safe from harm in a world where there are lots of bad guys who want to steal your stuff or mess things up. Bye bye now!