It's a conference between the parties, with a judge or magistrate, aimed at achieving a settlement. In my cases they happened behind closed doors, and the supposedly neutral magistrate acted more like the creditor's attorney. They will try to intimidate you to give in. Don't. You have to be strong, stand your ground, insist on your day in court.
Even if the magistrate threatens you and lies to you.
You might consider attending with someone else, a neutral party, as a witness, if that is allowed. In my case I probably had grounds to disqualify the magistrate, but since it happened behind closed doors with no record, I couldn't prove his abusive behavior in fact happened.