After effects video

Key Frames allow you to pinpoint certain areas of a picture in order to make it move (only on the pinpointed areas). It defines the starting and ending points of any smooth transition. It allows a still image to be transformed into a moving image. Here's an example of how Key Framing can be used:

https://www.youtube.com/watch?v=RWngi8U7R9I&feature=youtu.be