Compositing is the process of combining multiple visual elements — such as live-action footage, CGI, green screen keys, and graphics — into a single cohesive image or shot. This lesson covers the fundamentals of layer stacking order (what’s in front vs. behind), blending modes (how layers visually interact, like Multiply or Screen), and opacity control. Understanding these basics is essential because almost every VFX shot, no matter how complex, is ultimately built from multiple simpler layers combined together.