What is a key feature of a shape tween in Adobe Animate?

A key feature of a shape tween in Adobe Animate is that it specifically works with vector shapes. Shape tweens animate the transformation of vector graphics by allowing the properties of shapes to change over time, such as their form, color, or position, while maintaining their vector nature. This process relies on the mathematical representation of the shapes, which enables smooth transitions and morphing effects that are characteristic of vector graphics.

Furthermore, shape tweens do not function with bitmap images because bitmaps are pixel-based; they lack the scalability and mathematical characteristics required for this type of animation. The ability to create fluid animations that adapt to different shapes makes the use of vector graphics essential for effective shape tweening.