Okay, so you know how it's not cool to be mean to someone in person? Like hitting them or calling them names? The same goes for being mean on the internet, like making fun of them or spreading rumors about them online. That's called cyberbullying.
Now, a long time ago, before the internet existed, people had laws to stop people from being mean to each other in person. But when the internet was invented, people started being mean online too, so they needed new laws to stop that.
Cyberbullying laws are rules made by governments to stop people from being mean to others on the internet. These laws can be very different depending on where you live in the world, but they usually say that cyberbullying is against the law, and if someone is caught cyberbullying, they can get in trouble.
The laws can also protect people who are being cyberbullied. If someone is being cyberbullied, they can tell an adult, like a parent, teacher, or police officer. And if the cyberbullying is really bad, the police can get involved and try to find out who is doing it.
So in short, cyberbullying legislation are rules made by governments to stop people from being mean to each other online, and to protect people who are being cyberbullied.