The term "digipak" refers to a particular type of CD case, which essentially consists of a plastic CD tray glued inside a folding cardboard cover. Though it once referred specifically to the patented digipak packaging, the term has since become a genericized trademark generally used in reference to any cardboard-based CD package. Despite being made of paper, they were once considered an environmentally more friendly alternative to jewel boxes. However, they remain less common than jewel cases due to higher manufacturing costs and lower resistance to wear (particularly shopwear).
A taller form has been used for some DVD movie releases; it is essentially identical to the CD package, though with raised top and bottom sections to keep the disc from sliding out if it comes disengaged from the hub.
Read more about this topic: Optical Disc Packaging