This document discusses interactivity and interactive media. It defines interactivity as the communication process between humans and computer software where the program's outputs depend on user inputs. Examples of interactive platforms include mobile applications, 3D TV, video games, role-playing games, social media, massively multiplayer online role-playing games, and interactive websites. It also discusses types of interactivity like clicking on images, hotspots, rollovers, tabs, timelines, and frequently asked questions.