A pun is a form of wordplay that exploits the multiple meanings of a word or the fact that there are words that sound alike but have different meanings.
Here are some examples:
* "I'm reading a book about anti-gravity. It's impossible to put down!" This pun uses the double meaning of "put down" (to stop reading a book and to physically lower something).
* "Time flies like an arrow. Fruit flies like a banana." This pun uses the similar sound of "flies" in two different phrases with distinct meanings.
Let me know if you'd like more examples or want to explore specific types of puns!