A bug bounty program is like a game where you are a detective who helps companies find problems or "bugs" in their computer systems. Just like how you find hidden things in a treasure hunt, you will look for hidden mistakes and tell the company about them.
The company will give you rewards like money or gifts if you find a bug in their computer system. This helps them because they can fix the problems before bad people find them and use them to do bad things like stealing information or breaking into the system.
The bug bounty program is like a friendly competition between the detective, who is you, and the company, who wants to find the problems before anyone else does. It's a good way to make the internet safer for everyone.