Final answer:
Arraignments are the hearings where prisoners are brought before a judge to explain why they are being held.
Step-by-step explanation:
When prisoners are brought before a judge to explain why they are being held, it is known as an arraignment. This is the process where a person charged with a crime is formally informed of the charges against them, their right to counsel, and can enter a plea. It is an important step in the criminal justice system to ensure that the accused is aware of the allegations and their rights.