Embossing is impressing an image in relief to achieve a raised surface. Debossing is pressing an image into paper so it lies beneath the surface. Both can be registered over printing or on blank paper which is called blind embossing/debossing.
Foil film comes in a variety of colors, finishes and effects. A metal die is created for each foil color used in the design. The die is heated and then stamped using pressure, sealing a thin layer of the foil to the paper.