What are Digipaks?

Digipaks typically consist of a gatefold (book-style) paperboard or card outer binding, with one or more plastic trays capable of holding CDs or DVDs. 
Since digipaks are among the only alternatives to jewel cases to be used for major record companies the term is used generically even when the media holder is a hub or soft spot rather than a full plastic tray. Digipaks are a lot let resistant to abrasion than jewel cases and therefore show signs of wear relatively quickly. Due to this manufactures recommend coating the raw printed paper with a UV coating thus ensuring greater longevity.
This style of packaging  often used for CD singles or special editions of CD albums.

This is a standard digipak.