A window grille, also known as a window bar or window grate, is a decorative or security feature added to a window to divide it into smaller sections, creating a lattice pattern. Window grilles are typically made of metal, such as iron, steel, or aluminum, but can also be made of wood or other materials. They can be added to both interior and exterior windows, and can serve both aesthetic and practical purposes. Aesthetic purposes may include enhancing the look of a building, while practical purposes may include adding security by making it more difficult to break into a building through the window. Window grilles can be custom-made to fit the specific size and shape of a window, and they can be removable or permanently attached to the window frame.