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.

In justice and law, house arrest is a measure by which a person is confined by the authorities to their residence. Travel is usually restricted, if allowed at all. House arrest is an alternative to being in a prison while awaiting trial or after sentencing.