What is a Category?A category is a group of two or more scopes selected according to one or more criteria that they all possess, and represented by a “prototype” that represents the category. In humans this category is often indicated by a word. If I say the word “chair,” the image that appears in your mind is your prototype for that category. Any comparison creates a category, because even though it focuses on differences between the experiences compared, that presupposes that the two are similar (“comparable”) in some way.