Usually when we take fast action photos, we need to increase the shutter speed a lot so that the pictures won't be blurry. It's called freezing the action. Now with cameras capable of shooting at 1/4000 sec or even higher speed, freezing the action isn't that hard as long as we have plenty of light. But what if we shoot in low light situations that prevent us from using very high shutter speed? And shouldn't we purposely allow some blurriness to better convey the sense of fast action? That's when sometimes the panning technique comes very handy.