Nervous laughs, also known as 'GIGGLES' and 'hehs', are a type of laughter that is often used to express awkwardness or embarrassment. GIGGLES are typically short, high-pitched bursts of laughter, while hehs are usually longer and lower-pitched. They are often used in situations where someone is uncomfortable or unsure of how to respond. Nervous laughs can be seen as a way to break the tension in a situation, allowing people to relax and move on.