A bail bond is a contract between a court, a defendant and a bail bonds professional or business. When a person is arrested and detained in jail, the court determines the amount of money that a judge will require for a person's release from jail. This amount is called “bail”. If a defendant is unable to pay it, a surety bondsman can post a bail bond to secure a defendant’s release in exchange for a fee.

A bail bond is a form of loan. A bail bondsman posts a bond on the defendant’s behalf with the promise that the defendant will pay the court all or part of the bail amount if they do not show up for court. In exchange, the bondsman charges the defendant a non-refundable fee. The bondsman keeps this fee regardless of the outcome of the case. Usually, the fee is no more than 10% of the total bail amount.

Bail bonds have existed for centuries, with the earliest record of a bail bond coming from England in 1240. In modern times, bail bonds continue to be used to provide criminal suspects the opportunity to remain free until trial, or until their sentence has been served. Bail bonds are necessary to ensure a defendant's appearance in court. Studies have shown that the use of bail bonds leads to higher court appearance rates, meaning more criminal cases being tried in court.

The bail system is also seen as controversial by many. The bail system is widely seen as discriminatory to low-income defendants and as a contributing factor in the mass incarceration rates of young Black men. High bail amounts place an undo financial burden on defendants with no money to pay their own bail. This has resulted in nation-wide bail reform movements, the emergence of non-profit organizations specifically dedicated to bail reform, and numerous lawsuits.

In conclusion, bail bonds are an important component of the criminal justice system. They provide defendants the ability to remain free until trial, while also guaranteeing that defendants show up to court. The high cost of bail can be a burden to those who cannot afford it, which has spurred reform movements across the country. Bail bonds are an important yet complicated component of the criminal justice system, and understanding their purpose and implications is important.