Sliding glass doors are large, framed panels of glass that slide open and closed on a track. They are commonly used as entrances to patios, balconies, or backyards, allowing for easy access and a seamless transition between indoor and outdoor spaces. These doors are popular for their ability to let in natural light and provide a view of the outside. Typically made of tempered glass for safety, sliding glass doors can be found in various styles and sizes. They often feature a locking mechanism for security and can be customized with screens to keep insects out while allowing fresh air in.