Manipulation events are a wonderful companion to capturing mouse (pointer) movements and interpreting those actions into gestures. Manipulation modes map almost directly to the capabilities of the CompositeTransform, including: Translate, Rotation, and Scale.
Transforms in XAML are easy ways to manipulate an element within an encapsulated implementation, and almost always using the graphics processor instead of the lag-inducing central processor. Transforms are the heart of animations and beautiful user experiences.
Manipulation events enable you to handle multi-finger interaction, introduce velocity data, and detect core interactions like drag, pinch, and hold. In many ways, these are companions to the pointer events, but the manipulation framework is the only source for certain data.