Prototype is an important topic in psychology.  
What is a prototype?  Below is one definition of
prototype relevant to psychology:

Prototype Definition:

A prototype is a mental structure that reflects what
is perceived to be a typical example of a category

Prototype Examples:

     For the field of psychology, clinical psychology
may be considered the prototype subfield because it
may be perceived to be more typical of the category
of psychology than other subfields, such as
environmental psychology.

   For the category of birds, a robin may be
perceived to be prototype for birds than other birds.