Admission to bail is an order from the court that grants permission to a criminal defendant to be released from jail if he or she posts bail. Bail is an amount of money that must be paid for the defendant to be released before they have their trial. People who post bail are still required to appear in court on their trial date.
Bail is designed to make sure that defendants return to court for their trial. If a person returns to court to have their trial, and they see it through, then they will get their bail money back. If a defendant cannot afford to post bail, then they can have a bail bondsman post on their behalf. However, bail bondsmen typically take a fee of around 10–15% to provide this service. That is how they make a profit.