Sarcasm is a form of verbal irony where someone says the opposite of what they really mean, often in a mocking or humorous way. It is commonly used to convey contempt or to emphasize a point. For example, if someone sees a messy room and says, "Wow, this place is so tidy," they are being sarcastic. People often use sarcasm in everyday conversations, and it can be found in various forms of media, including movies and television shows. While it can be entertaining, sarcasm can sometimes lead to misunderstandings, as the intended meaning may not be clear to everyone involved.