Judicial Review, is a review by the court of law of actions of a government official or entity or of some other legally appointed person or the review by an appellate court of the decision of a trial court.
Example One: Roe vs Wade : court overturned a Texas law prohibiting abortion.
Example Two: Brown vs Board o Education : racial segregation deemed illegal in schools
Example Three: Texas vs Johnson : Court overturned a Texas law prohibiting desecration of the United States flag.