This document provides an introduction to media institutions, including definitions of key terms like conglomerate and cross-media ownership. It discusses the major media conglomerates - The Walt Disney Company, News Corp, and Time Warner - and how they have acquired numerous subsidiaries across television, film, publishing, and other media. The document also addresses criticisms of increasing media consolidation, such as reduced diversity and competition as a small number of large conglomerates come to dominate the media industry globally.