A "curveball" refers to an unexpected event or situation that disrupts plans or assumptions. The term originates from baseball, where a curveball is a pitch that changes direction unexpectedly, making it difficult for the batter to hit. In everyday life, a curveball can manifest as an unforeseen challenge or surprise that requires quick thinking and adaptability. In various contexts, such as business or personal relationships, encountering a curveball can lead to new opportunities or necessitate a change in strategy. Learning to navigate these unexpected situations can enhance problem-solving skills and resilience, ultimately contributing to personal growth and success.