A "Showstopper" refers to a performance or element in a production that captures the audience's attention and elicits strong applause or admiration. This term is commonly used in the context of theater, music, and dance, where a particular song, dance number, or scene stands out due to its exceptional quality or emotional impact. In a broader sense, "Showstopper" can also describe any product, feature, or event that significantly impresses or surprises people. For example, a new technology or innovation that revolutionizes an industry might be labeled a showstopper, highlighting its potential to change the game.