This document summarizes several key media concepts and theories related to genre, representation, media language, and audience. It discusses how genre is a negotiated process that changes over time according to theorists like Buckingham, Neale, and Metz. Representation theorists like Peirce, Gauntlett, and Baudrillard explore how identity and reality are constructed through signs. Theories of media language from Goodwin and Vernallis analyze elements like narrative, editing, camerawork, and diegesis in music videos. Theories of audience from Hall, Hartley, McQuail, and Ang examine how audiences are defined, relate to institutions, and exist as imagined entities.