Right!

   Concept: A mental category used to represent a class or group of objects, people, organizations, events, situations, or relations that share common characteristics or attributes.

    Formal Concept: A concept that is clearly defined by a set of rules, a formal definition, or a classification system; also known as an artificial concept.

   Natural Concept: A concept acquired not from a definition but through everyday perceptions and experiences; also known as a fuzzy concept.

    Prototype: An example that embodies the most common and typical features of a concept.