Banishment in the Torah means that if someone did something bad, they would be sent away from their community and not allowed to live with them anymore. It's like a timeout, but much more serious.
For example, if someone broke one of the Ten Commandments, like stealing or worshipping another god, they would have to leave their village and go live somewhere else. This was to protect the community from further harm and to teach the person a lesson.
Being banished wasn't just about leaving your home, it meant that you were shunned by your community and had no one to turn to. It was a punishment that was meant to make you reflect on your actions and change your behavior.
In the Torah, banishment was seen as a way to maintain the community's moral standards and protect everyone's well-being. It was a serious punishment, but it was also a way to help people grow and learn from their mistakes.