In legal terms, a plea is simply an answer to a claim made by someone in a criminal case under common law using the adversarial system. Colloquially, a plea has come to mean the assertion by a defendant at arraignment, or otherwise in response to a criminal charge, whether that person pleaded or pled guilty, not guilty, nolo contendere (a.k.a. no contest), no case to answer (in the United Kingdom), or Alford plea (in the United States). The concept of the plea is one of the significant differences between criminal procedure under common law and procedure under the civil law system. Under common law, a defendant who pleads guilty is automatically convicted, and the remainder of the trial is used to determine the sentence. This produces a system known as plea bargaining, in which defendants may plead guilty in exchange for a more lenient punishment. In civil law jurisdictions, a confession by the defendant is treated like any other piece of evidence. A full confession does not prevent a full trial or relieve the prosecutor from presenting a case to the court. Types of plea The most common types of plea are "guilty" and "not guilty". Pleading guilty typically results in a more lenient punishment for the defendant; it is thus a type of mitigating factor in sentencing. In a plea bargain, a defendant makes a deal with the prosecution or court to plead guilty in exchange for a more lenient punishment, or for related charges against them to be dropped. A "blind plea" is a guilty plea entered with no plea agreement in place. Plea bargains are particularly common in the United States. Other countries use a more limited form of plea bargaining. In the United Kingdom and Germany, guidelines state that only the timing of the guilty plea can affect the reduction in the punishment, with an earlier plea resulting in a greater reduction. In the United States, a nolo contendere (no contest) plea is when the defendant submits a plea that neither admits nor denies the offense. It has the same immediate effect as a guilty plea because the trial avoids determining the defendant's guilt. Peremptory pleas These pleas claim that a case cannot proceed for some reason. They are so-called because, rather than being an answer to the question of guilt or innocence, they are a claim that the matter of guilt or innocence should not