Clear and convincing evidence is a standard of proof that requires a party to present evidence that is highly and substantially more likely to be true than not. This level of proof is stronger than the preponderance of the evidence standard but lower than beyond a reasonable doubt. It is often used in civil cases where a party seeks to establish a claim or defense that requires a higher level of certainty, impacting various stages of litigation, including motions for summary judgment, relief from judgment, and standards of review.