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A kinematic link (as opposed to a dynamic link) is not affected by external forces. It can influence other bodies in its vicinity, but it's not influenced by them. You can use the kinematic property of a link to take control of the link from the physics engine. Then you get to define by yourself how the link should move in the world (for example, to create an animation). Here is a reference to the kinematic state.

Below you can see how a box interacts with gravity and a sphere, with disabled and enabled kinematic state.

kinematic-state