Smart windows are advanced glass technologies that can change their properties in response to environmental conditions. They can adjust their tint or transparency based on sunlight, temperature, or user preferences, helping to control heat and light in a building. This feature can enhance energy efficiency by reducing the need for heating and cooling systems. These windows often use materials like electrochromic or photochromic coatings, which react to electrical signals or UV light. By optimizing natural light and reducing glare, smart windows contribute to a more comfortable indoor environment while also lowering energy costs for homeowners and businesses.