Lie detection refers to the process of determining whether a person is being truthful or deceptive. Various methods are used for this purpose, including polygraph tests, which measure physiological responses like heart rate and sweat production. Other techniques involve analyzing verbal and non-verbal cues, such as body language and facial expressions. While lie detection can be useful in certain situations, its accuracy is often debated. Factors like stress, anxiety, and individual differences can affect results. Additionally, no method is foolproof, and ethical considerations arise when using lie detection in legal or personal contexts, such as during interrogations or interviews.