Clipping path is a term used in the graphic industry which refers to the process of creating an outline around a certain image without having to modify or erase even a single pixel of the image. Clipping path is done by using Photoshop's mighty pen tool. A silhouette of an area that serves as a mask and the only portion of the image that has been clipped appears visible while the area outside the clipping path then becomes transparent. See More at : http://clippingpathstate.com/