A VFX compositor is a software tool used in the film and television industry to combine multiple visual effects (VFX) layers into a single, seamless image. This process involve layering, masking, and blending different elements such as 3D models, animations, and live-action footage to create complex visuals such as explosions, creatures, and environments. VFX compositors are essential in creating realistic and convincing visuals in films and TV shows.