Typical and familiar members of a particular class by which many of our concepts are defined:

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Prototypes are typical and familiar members of a particular class that help us define our concepts. They are mental representations that closely match the features of a given category and serve as a reference point for identifying new instances of that category. For example, a robin might be considered a prototype for the category of birds, as it possesses many of the typical features that we associate with birds (e.g., wings, beak, feathers, ability to fly).

Typical and Familiar Members of a Particular Class by Which