Animation is the rapid display of images to create the illusion of movement. It can be created through techniques like cell animation (hand drawing each frame), stop motion (manipulating physical objects), and 3D animation (digitally modeling and manipulating objects). 3D animation involves processes like modeling, rendering, motion capture and morphing to create animated characters and scenes. Virtual reality uses computer simulation to immerse users in realistic or imaginary environments through interactive technologies like simulators, walkthroughs and navigable scenes.