Cite as: 507 U. S. 725 (1993)
Opinion of the Court
rule is "error" unless the rule has been waived. For example, a defendant who knowingly and voluntarily pleads guilty in conformity with the requirements of Rule 11 cannot have his conviction vacated by a court of appeals on the ground that he ought to have had a trial. Because the right to trial is waivable, and because the defendant who enters a valid guilty plea waives that right, his conviction without a trial is not "error."
Waiver is different from forfeiture. Whereas forfeiture is the failure to make the timely assertion of a right, waiver is the "intentional relinquishment or abandonment of a known right." Johnson v. Zerbst, 304 U. S. 458, 464 (1938); see, e. g., Freytag v. Commissioner, 501 U. S. 868, 894, n. 2 (1991) (Scalia, J., concurring in part and concurring in judgment) (distinguishing between "waiver" and "forfeiture"); Spritzer, Criminal Waiver, Procedural Default and the Burger Court, 126 U. Pa. L. Rev. 473, 474-477 (1978) (same); Westen, Away from Waiver: A Rationale for the Forfeiture of Constitutional Rights in Criminal Procedure, 75 Mich. L. Rev. 1214, 1214- 1215 (1977) (same). Whether a particular right is waivable; whether the defendant must participate personally in the waiver; whether certain procedures are required for waiver; and whether the defendant's choice must be particularly informed or voluntary, all depend on the right at stake. See, e. g., 2 W. LaFave & J. Israel, Criminal Procedure § 11.6 (1984) (allocation of authority between defendant and counsel); Dix, Waiver in Criminal Procedure: A Brief for More Careful Analysis, 55 Texas L. Rev. 193 (1977) (waivability and standards for waiver). Mere forfeiture, as opposed to waiver, does not extinguish an "error" under Rule 52(b). Although in theory it could be argued that "[i]f the question was not presented to the trial court no error was committed by the trial court, hence there is nothing to review," Orfield, The Scope of Appeal in Criminal Cases, 84 U. Pa. L. Rev. 825, 840 (1936), this is not the theory that Rule 52(b) adopts. If a legal rule was violated during the district court proceed-
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