You can use key points to represent a beginning or end of a change in animation position or other attributes at a given time. Whenever you position a new key point, it corresponds to motion or to changes to visual attributes.
Key frames define the portion of the timeline that separates key points.

A Key point is the entity that corresponds to defined assembly component positions, visual properties, or simulation element states.
The Key frame is the area between key points, which can be any length of time. It defines the time frame in which assembly component motion or visual property changes take place.
A View key is a view of the model at a particular point in time (camera view or model view). View keys appear in the Orientation and Camera Views key frame.
Identifying Key Points
You can identify key points by color.