Admissibility refers to the criteria that determine whether evidence or testimony can be presented in a legal proceeding. Courts assess admissibility based on rules that ensure the evidence is relevant, reliable, and not overly prejudicial. This process helps maintain fairness in the judicial system. In the context of a trial, admissibility is crucial for both the prosecution and defense. For example, if a piece of evidence, such as a witness statement or document, does not meet the admissibility standards, it may be excluded from consideration, potentially impacting the outcome of the case.