Prototype Theory is a cognitive science concept that suggests people categorize objects and ideas based on typical examples, or "prototypes," rather than strict definitions. For instance, when thinking of the category bird, one might picture a robin or sparrow rather than a penguin, which may not fit the common image of a bird. This theory highlights that categories are not rigid but rather fluid, allowing for variations and exceptions. It emphasizes that our understanding of concepts is shaped by our experiences and the most representative examples we encounter, influencing how we perceive and interact with the world around us.