Duress of threat is a legal defense asserting that a person committed a crime because they were compelled to do so under the threat of immediate harm or death to themselves or others. This concept is vital in understanding how coercion can impact an individual's ability to make free choices, raising questions about their culpability in criminal acts. The essence of this defense lies in the belief that no reasonable person would choose to act otherwise when faced with such threats, highlighting the conflict between legal responsibility and moral choice.