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To complement Eric's answer:
Three-dimensional graphics have a built-in interactivity, aimed at exploring a given (fixed) 3D figure.
The programmable interacivity of interact widgets isn't limited to 2D plots. It allows to vary the parameters of a computation (a priori any computation). For example, you may envision to control the scale, range and precision of some statistical estimation or simulation, as well as the visual parameters of its representation.
The fact that most of its examples are 2D graphics-oriented is not a built-in limitation of the widgets' interactivity.
