The over-all process of posting bail bonds usually require an agreement between a bail agent, usually a bail bondsman, and the defendant who is posting bail. In this kind of agreement, the agents guarantees the court that the defendant will appear in front of the court every time that the judge sees fit.
Most people make the mistake of thinking that using bail bonds is a sure way for them to be able to skip their responsibility to the court. This cannot be far from the truth. If anything, posting bail bonds ties the defendant to the grasp of the court and gives the authorities the security that they need in order to ensure that the accused will not skip town. If the defendant fails to show up for their predetermined court appointment, not only will the bail be nullified, but the court has full power to bring the accused back in jail.