What is sliding glass door?

A sliding glass door or patio door, is a type of sliding door in architecture and construction, is a large glass window opening in a structure that provide door access from a room to the outdoors, fresh air, and copious natural light. A sliding glass door is usually considered a single unit consisting of two panel sections, one being fixed and one a being mobile to slide open. Another design, a wall sized glass pocket door has one or more panels movable and sliding into wall pockets, completely disappearing for a 'wide open' indoor-outdoor room experience.

Sliding glass doors are popular in Southern Europe and throughout the United States, being used in: hotel rooms, condominiums, apartments, and residences; for access to upper balconies; for large views out - enhanced natural light in; and to increase incoming fresh air. In addition Sliding glass doors are commonly used in some regions as doors between the interior rooms of a home and a courtyard, deck, balcony, patio, and a garden, backyard, barbecue or swimming pool area. They are often called Patio doors in this context. They are also used in interior design, often in offices and automobile sales areas, to give soundproof but visually accessible private office space. In residential interiors they are used, often with translucent 'frosted' glass replicating a traditional Shōji door, to allow daylight to penetrate further into the dwelling and expand the sense of interior spatial size.

Know more here 6 different types of sliding doors .