Failure to state a claim upon which relief can be granted is a legal standard used to evaluate whether a plaintiff's complaint has sufficient factual matter to support a legal claim. This concept is primarily addressed in Rule 12(b)(6) of the Federal Rules of Civil Procedure, which allows defendants to challenge the legal sufficiency of a plaintiff's claims before proceeding to trial. If the court finds that the complaint lacks the necessary elements or facts to establish a claim, it may dismiss the case.