Windows and doors are essential architectural elements in buildings, serving both functional and aesthetic purposes. Windows are openings typically filled with glass to allow natural light and views while providing ventilation. They come in various styles—such as casement, double-hung, and sliding—and materials like slim profiled aluminium, wood, and UPVC (unplasticized polyvinyl chloride), which often feature energy-efficient technologies such as double or triple glazing and Low-E coatings to improve insulation. Additionally, integrated window venetian blinds offer a modern solution, allowing for adjustable light control without the need for external window treatments. Similarly, doors function as entrances and exits, providing security, privacy, and separation between spaces. They are available in various types, including hinged, sliding, and bi-fold doors, and can be made from materials like wood, fiberglass, and steel, which impact durability and insulation. Together, windows and doors not only enhance the flow of light and air but also significantly influence the aesthetics, energy efficiency, and security of a building, making them vital components of architectural design.