Kawase blur effect
This is a faster version of the traditional "Blur" effect. It's recommended that you use this one rather than the "Gaussian" blur effect.
The Pixelize X and Pixelize Y properties let you blur more on one axis than the other, which is handy for a directional (motion-like) blur. Increasing the Quality gives a smoother result at the cost of some performance.
Reference
All effects are listed in the effects reference page.