What is the effect of applying a Motion Blur to a layer?

Applying a Motion Blur to a layer enhances the perception of movement by softening the edges of that layer. When motion blur is enabled, After Effects simulates the blurring that occurs when an object is in fast motion, much like how a camera captures blurriness as a moving subject passes through the frame. This effect results in a more natural and organic appearance, making animations feel fluid and less jarring.

Softening the edges while the object moves helps to convey speed and direction, enhancing the overall visual experience. This technique is particularly effective in animation and video effects, where maintaining a sense of realism is crucial for viewers to remain engaged with the movement.