Jury tampering means that someone tries to convince jurors (the people who decide if someone is innocent or guilty in a trial) to vote a certain way. This is not allowed because the jurors are supposed to make a fair decision based only on the facts and evidence presented in court.
It's like if you had to vote on which toy to play with at school, and someone tries to convince you to pick their favorite toy even if you don't really like it. That wouldn't be fair, right? It's the same with jury tampering.
Jury tampering can take many forms, like offering jurors money, threatening them, or trying to influence them in other ways outside of the courtroom. This is against the law because everyone deserves a fair trial and a fair chance to defend themselves.
If someone is caught tampering with a jury, they can get in big trouble and even go to jail. That's why it's important to always be honest and fair when it comes to things like this.