Plain-language explanation.
Media theory tries to explain how the media — newspapers, television, radio, the internet — shape what we know, think, and feel. Different theories have different ideas about how powerful the media is. Some say media tells us what to think about (agenda setting). Others say audiences actively interpret media messages rather than passively absorbing them.
Core concepts and standard treatment.
Key media theories: medium theory (McLuhan — the medium is the message; hot vs. cool media; global village), agenda-setting theory (McCombs and Shaw: media do not tell us what to think, but what to think about — by selecting and emphasising certain issues), framing theory (Entman: selecting some aspects of perceived reality and making them more salient), cultivation theory (Gerbner: heavy TV viewing cultivates perceptions of a mean, violent world), uses and gratifications (Blumler and Katz: audiences actively use media to fulfil needs — information, entertainment, social interaction, personal identity), and encoding/decoding (Stuart Hall: producers encode meaning, audiences decode with dominant, negotiated, or oppositional readings).
Deeper theory, debates and edge cases.
Critical media theory (Frankfurt School: Adorno and Horkheimer, culture industry critique — mass media as ideology producing false consciousness; Habermas and the public sphere); political economy of media (Chomsky and Herman's propaganda model — ownership, advertising, sourcing, flak, and ideology as news filters). Media representation: semiotics (Barthes: denotation and connotation, mythology — the naturalisation of ideology), representation theory (Hall: stereotyping, othering, the politics of representation in race, gender, sexuality).
How it is applied in practice.
Media theory in professional practice: PR and communications professionals use framing and agenda-setting theory to shape media coverage. Advertising practitioners use cultivation and effects theory to understand media context effects on message reception. Policy analysts use public sphere theory to evaluate media pluralism, ownership concentration, and the conditions for democratic deliberation. Algorithmic media: social media recommendation systems (YouTube, TikTok, Facebook News Feed) are transforming agenda-setting from editorial gatekeeping to algorithmic curation — with implications for filter bubbles, polarisation, and misinformation spread.