A "Not Guilty Plea" is a formal statement made by a defendant in a criminal case, indicating that they do not admit to the charges against them. This plea asserts the defendant's belief that they are innocent of the alleged crime and that the prosecution must prove their guilt beyond a reasonable doubt. When a defendant enters a not guilty plea, the legal process continues, often leading to a trial where evidence is presented. The burden of proof lies with the prosecution, which must convince the judge or jury of the defendant's guilt. This plea is a fundamental right in the U.S. legal system.