Lujan v. Defenders of Wildlife is a landmark Supreme Court case from 1992 that addressed the issue of standing to sue in federal court, focusing on whether plaintiffs have the right to bring a case based on potential environmental harm. The decision established that plaintiffs must demonstrate a concrete and particularized injury, as well as a direct connection between that injury and the conduct they are challenging. This case highlights critical limits on judicial power, emphasizing that not everyone who disagrees with government action can challenge it in court.