Humor is a cognitive ability that provokes amusement and laughter in people of all ages and cultures. The concept originated from ancient Greek medicine, which believed that balancing bodily fluids, or humors, controlled emotions. While a sense of humor is subjective, what people find funny depends on factors like age, education, culture, and context. For example, children often enjoy slapstick comedy, while more sophisticated forms of humor like satire require understanding social meanings.