You can make an object move across the Stage, increase or decrease in size, rotate, change color, fade in or out, or change shape. In tweened animation, you create starting and ending frames and let Flash create the frames in between. Flash can create two types of tweened animation. In the first, called motion tweening, you define properties such as position, size, and rotation for an instance, group, or type block at one point in time, and then you change those properties at another point in time. In the second, called shape tweening, you draw a shape at one point in time, and then you change that shape or draw another shape at another point in time.
Flash interpolates the values or shapes for the frames in between, creating the animation.
Important Concepts Vector-based Graphics Bitmap graphics describe images using colored dots, called pixels, arranged within a grid while vector graphics describe images using lines and curves, called vectors, that also include color and position properties. Compared to the bitmap images, vector graphics tend to be compact, taking much less. Since Flash is a vector-based animation program, it allows you to create animations with very small size, which can be played back on the Web smoothly. Keyframes A keyframe is a frame where you define changes in the animation. In tweened animation, you define keyframes at important points in the animation and let Flash create the content of frames in between.