Tweening is the process of automatically generating intermediate values between two start and end values. You define the start and end values manually, and let the computer do the calculations to go from start to end, applying smoothing methods if requested.

Considering this concept, you can tween scale, position, rotation, and more. Indeed, if we needed to tween our window's scale from 0 to 1, we could simply tween the three X, Y, and Z scale values, and the window will gradually become bigger until it reaches its final size.

With NGUI, we have a component to do just that—the Tween Scale component.

The Tween Scale component can be added to any GameObject to configure a scale tween from one value to another within a given duration. Let's see how it works.