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. Interactive media allows two-way communication through platforms like social media, video games, mobile apps, and virtual reality. It provides examples of how users interact on Facebook and Instagram. The document also outlines nine types of interactivity on websites, including clickable images, hotspots, rollovers, tabs, timelines, and flip cards.