Definitions

representation - the action of speaking or acting on behalf of someone or the state of being so   represented.
                       - the description or portrayal of someone or something in a particular way.
                       - it is about the selection (tv only shows certain clips), the relationship (between people, groups, places or events in the world. between whats showed on the TV and on reality) and the process (by which the representation is made)

ideology - a system of ideas and ideals, especially one which forms the basis of economic or political theory and policy.
               - the science of ideas; the study of their own origin and nature.

hegemony - the way people in power dominate others and stay in power.
                  - the leadership or dominance, specially by one especially by one state or social group ovr others.