No, you cannot be jailed without being arrested. Being arrested is a necessary legal procedure that precedes jailing a person. An arrest involves taking someone into custody when there is probable cause or a reasonable suspicion that a crime has been committed.
During an arrest, individuals are typically taken to a police station, booked, and charged with a crime. Following the arrest and charging, the person may be released on bail or held in jail awaiting further legal proceedings, such as a trial or a hearing.