Bail is a set of pre-trial restrictions that are imposed on a suspect to ensure that they will not hamper the judicial process. Court bail may be offered to secure the conditional release of a defendant with the promise to appear in court when required. In some countries, especially the United States, bail usually implies a bail bond, a deposit of money or some form of property to the court by the suspect in return for the release from pre-trial detention. If the suspect does not return to court, the bail is forfeited and the suspect may be charged with the crime of failure to appear. If the suspect returns to make all their required appearances, bail is returned after the trial is concluded.

Pre-trial detention, also known as jail, preventive detention, provisional detention, or remand, is the process of detaining a person until their trial after they have been arrested and charged with an offence. A person who is on remand is held in a prison or detention centre or held under house arrest. Varying terminology is used, but "remand" is generally used in common law jurisdictions and "preventive detention" elsewhere. However, in the United States, "remand" is rare except in official documents and "jail" is instead the main terminology. Detention before charge is commonly referred to as custody and continued detention after conviction is referred to as imprisonment.