1) Convenient and practical: the traditional swing opening is easy to operate by pushing the handle in or out. 2) High space utilisation: side opening needs no sash rotation, occupying no extra indoor or outdoor space — ideal for narrow corridors and small bedrooms, and the sash moving parallel to the wall frees the walkway. 3) High safety: usually multi-point locks give high security and prevent unauthorised entry; it can be reinforced fire- and burglar-proof. 4) Good sealing: it keeps out wind, noise and dust, reducing indoor noise, holding temperature and improving comfort; in cold seasons it cuts heat loss and raises energy efficiency. 5) Attractive: customisable in material, colour and style to match the interior and facade; higher light transmission brightens the room. In short, it is a convenient, space-efficient, safe, well-sealed and attractive door/window system for various homes.