Tweening is a process, where the animator uses the computer to facilitate smoother movements.
Imagine this, you have a dot, and it needs to move from position A to position B in C frames.
You make two tweens, one where the dot is at position A, and another one where it’s at position B. They are spaced C frames apart.
When you play, the frames in C stop being a singular space, and instead a range. In this range, the computer fills in frame D which is an in-between of frame A and frame B.
Now, easings are used to tell the computer how fast (or slow) the motion of (frame) A -> (frame) B should be.
Easings
- None (Linear, moves like a robot.)
- In (Quadratic-In, slower in the start, gets faster in the end.)
- Out (Quadratic-Out, slower in the end, faster in the start
- In-Out (Both Out and In.)
I grabbed this from a earlier post.