This document discusses several theories about how audiences interact with media:
1) The Hypodermic Needle Theory suggested media could passively change audiences' thinking, but it is now seen as too simplistic.
2) Uses and Gratification Theory argues audiences actively seek media to fulfill needs like diversion, social interaction, information, and identity.
3) Two Step Flow Theory proposes ideas spread from media to opinion leaders and then to the general public.
4) Reception Theory recognizes audiences actively interpret media based on social and personal factors, though encodings aim to guide interpretations.