Knock-Knock jokes are a popular form of humor that typically involve a call-and-response format. One person starts by saying "Knock, knock," and the other responds with "Who's there?" This exchange continues with the first person providing a name or phrase, leading to a punchline that often includes a pun or play on words. These jokes are simple and often appeal to children and adults alike due to their lighthearted nature. They can be easily shared in social settings, making them a fun way to engage with friends and family. Overall, Knock-Knock jokes are a classic example of wordplay in comedy.