The phrase "double glass doors" refers to a pair of doors made entirely or primarily from glass. These doors typically consist of two panes of glass, one on either side of a frame, with hinges that allow them to open and close like regular doors. The term can also refer to sliding glass doors, which have two or more sheets of glass that slide horizontally alongside each other. Double glass doors are often used in residential settings for entrances, patios, and decks, as well as in commercial spaces such as stores, offices, and restaurants.