The internal representation is the...
the data representation (stored in the instance variables) of an object
Known as mental maps, our internal representations are the result of our pictures, sounds, thoughts and feelings. These govern our behaviour in the external world.
A symbolic representation in a computer of the states and processes of problem solving, search, etc. See also Cognitivsm, Knowledge Representation.
The structure and organization used to represent objects, such as font objects, in the operating system.