Bail is money that you provide to ensure that you will appear in court for trial. If you do not have the money to post bail, a relative or friend can post bail on your behalf (or you can go to a bail bondsman, described below). After the trial ends, the court will refund the bail money, usually keeping a percentage for administrative costs.
Bail is set according to a “bail schedule” published by the Superior Court in each County. Many defendants will receive an “own recognizance” release and will not have to post bail.