Why are zero-day exploits a major threat to cybersecurity?

Zero-day exploits are like sneaky intruders who find a secret door into your house that no one else knows about, and they use it to steal your toys before you even notice.

Imagine you have a toy box with a lock. Every day, you use the same key to open it. One day, someone finds out that the lock can be opened without the key, maybe by pushing in a special spot or using a tiny tool. That person is like a zero-day exploit, they found a hidden way into your toy box before anyone knew about it.

A zero-day exploit happens when hackers discover a weakness in a computer program, phone app, or video game that the developers didn’t know about. They use this secret weakness to get inside without needing a password, just like opening the toy box with a hidden trick.

This is super sneaky because the people who made the app or game don’t know about the secret door yet. That means they can’t fix it until someone tells them, and by then, lots of people might already have their toys stolen!