CDF Interactivity
A few examples of what you can ask Wolfram|Alpha about:
3D Graphics
rotate, scale, and zoom 3D graphics
visualize the structure of a molecule
Plots & Maps
hover over a plot to see data values
resize plots, maps, and other graphics
Physics Demonstrations
manipulate variables to change plots in real time
view an animation of a computed trajectory
view an animation of a thermodynamic cycle
Interactive Math Plots
interactively adjust plot ranges
visualize solutions to an equation with a parameter
interactively trace a curve by varying the parameter
Differential Equations
interact with differential equation plots
Differential Geometry
analyze a function with interactive visualizations
Complex Analysis
interactively visualize a complex map
visualize the rotation associated with a quaternion