The document discusses visual effects (VFX) and special effects (SFX) in filmmaking. It defines VFX as the creation or manipulation of imagery that does not physically exist through techniques like CGI, compositing, and matte painting. SFX modify the real world on set through practical effects like explosions and stunts. The document provides examples of VFX and SFX from Bollywood and Hollywood films and outlines some common VFX techniques like animation, rotoscoping, and match moving. It explains the benefits of using VFX to enhance stories, reduce costs, and allow impossible or dangerous shots.