Defense in criminal cases refers to the strategies, arguments, and evidence presented by an accused individual (or their lawyer) to challenge the prosecution’s case, reduce or eliminate criminal liability, or mitigate a potential sentence. These defenses operate on either factual grounds, like establishing an alibi, or legal grounds, such as self-defense or insanity. A successful defense can lead to acquittal, a reduced charge, or a lighter punishment, and is a fundamental protection within a justice system.