The complaint standard refers to the legal requirement for a plaintiff to present a sufficient and clear statement of their claim in a lawsuit, outlining the necessary facts that support their case. This standard is crucial for establishing jurisdiction, especially when asserting federal question jurisdiction, as it determines whether the court has the authority to hear the case based on the issues raised in the complaint. A well-crafted complaint must contain enough detail to inform the defendant of the nature of the claims against them and allow them to prepare a defense.