What does Tweening help to create in animations?

Tweening is a fundamental technique in animation that allows animators to create smooth transitions between two keyframes. The process involves generating intermediate frames that blend the starting and ending positions, thus creating the illusion of movement. This is particularly important in animation because it ensures that motions appear fluid and continuous rather than a series of abrupt changes, which could distract viewers.

By using tweening, animators can save time and effort, as they do not need to create every single frame manually. Instead, they define the keyframes, and the software automatically fills in the in-between frames. This capability makes it possible to convey complex actions and emotions effectively within a limited timeframe.

The other options focus on different aspects of animation production. For instance, background music and sound effects contribute to the sensory experience of animation but do not directly relate to visual movement. Keyframes are critical in the tweening process, as they are the starting and ending points, but they do not encompass the primary function of what tweening achieves on its own—as creating the illusion of movement is the goal of tweening.