Original: During the Monday Night Wars, the World Wrestling Federation (WWF) and World Championship Wrestling (WCW), the two top North American wrestling promotions, competed for ratings.
Simplified: The Invasion was a wrestling storyline in the World Wrestling Federation (WWF) that began after the WWF bought World Championship Wrestling (WCW). During the Monday Night Wars, the World Wrestling Federation (WWF) and World Championship Wrestling (WCW), the top 2 North American wrestling shows, competed for ratings.