Method #
Blur nodes defocus images, making them appears less clear. These are useful in many scenarios, from cleaning up the harsh edges on a key mask to creating depth of field for the image. They follow the same order of operations as all the other post-fx nodes.
Blur Nodes can be applied to all the same nodes as the rest of the post-fx nodes.

Add a simple blur effect to an image.

Apply a depth of field blur to 3D scenes.

Add a blur effect along a direction to an image.

Add a blur effect but preserve detailed areas to an image.

Add a blur which trails across the image to an image.

Add a wider blur or glow effect to an image.

Overlay the previous frame over the current frame.

Add a simple glow effect to an image.

Add a glow effect which stays resolution independent to an image.

Apply motion blur to objects in a 3D scene.

Add a blur effect which pushes outwards to an image.

Add a tilt shift effect to an image.

Add a damaged VHS effect to an image.