South-facing windows are openings in a building that face towards the south. They receive direct sunlight for most of the day, especially in the winter months when the sun is lower in the sky. This orientation can help warm a space naturally and reduce heating costs. In addition to providing warmth, south-facing windows can enhance natural light in a room, making it feel brighter and more inviting. They are often used in sustainable building designs to maximize energy efficiency and improve indoor comfort. Proper shading can help control heat gain during the summer months.