A pun is a form of wordplay that exploits multiple meanings of a word or similar-sounding words for humorous effect. Puns often rely on the double meanings of words, creating a clever twist that can make people laugh. For example, saying "Time flies like an arrow; fruit flies like a banana" plays with the different meanings of "flies." Puns can be found in various forms of communication, including jokes, literature, and everyday conversation. They are commonly used in comedy routines and advertising to engage audiences and make messages more memorable. Overall, puns add a playful element to language.