Laughter

Laughter is a typically pleasant physical reaction and emotion consisting usually of rhythmical, usually audible contractions of the diaphragm and other parts of the respiratory system. It is a response to certain external or internal stimuli. Laughter can rise from such stinuli as being tickled, or from humorous stories, imagery, videos or thoughts.

Most commonly, it is considered an auditory expression of a number of positive emotional states, such as joy, mirth, happiness or relief.
On some occasions, however, it may be caused by contrary emotional states such as embarrassment, surprise, or confusion such as nervous laughter or courtesy laugh.
Age, gender, education, language and culture are all indicators as to whether a person will experience laughter in a given situation.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0