Sliding glass doors are two panes of glass with at least one pane set on a track, allowing it to slide in one direction to open. While some sliding glass doors have one set pane and one movable pane, other sliding glass doors have two movable panes, each sitting in adjacent tracks, allowing the panes to move past each other. Sliding glass doors are common patio entryways, and those are sometimes referred to as sliding patio doors.

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