If you do not appear in court, the judge will issue a warrant for your arrest. The warrant allows the cops to find you and take you to jail.
If there is a good reason for your failing to appear in court, you should contact an attorney right away. The attorney can set a hearing to try to get the warrant recalled so that you do not have to go to jail, so long as you appear for all court dates set in the future.
Posted in: Violation of Probation