The document discusses the history and process of special effects in filmmaking. It begins with a brief overview of how special effects have been used as far back as the 1700s by magicians and progressed to techniques like matte paintings and rear projection screens in early films. The document then focuses on modern special effects, highlighting CGI techniques used in films like Jurassic Park, Avatar, and Harry Potter to bring imaginary worlds and creatures to life. It also describes the multi-step post-production process that visual effects artists use to add effects like explosions and integrate computer graphics into live-action footage.