Capturing a moving subject due to a use of an inappropriate shutter speed is called motion blur. It produces the effect of something leaving a trail behind itself when moving. Capturing movement in images is something that many photographers only think to do when they are photographing sports or other fast moving subjects.

You can get Motion blur pictures by using 2 techniques, both of them rely on the appropriate shutter speed to be used.

Moving subject/Still camera:
In this technique you can get photos by having your camera completely still focusing on the moving subject. This will make the background or the setting of the photograph appear perfectly sharp and the motion blur effect will only be visible on the moving element.

Moving Subject/Moving Camera:
This is also called panning technique. In this technique you can photos by following the movement subject with the movement of your camera. It will make the background blurred while leaving the subject in focus.