Thermal insulation is a material or method used to reduce the transfer of heat between objects or environments. It helps keep spaces warm in winter and cool in summer, making buildings more energy-efficient. Common insulation materials include fiberglass, foam, and cellulose, which trap air and slow down heat flow. In homes, thermal insulation is often found in walls, attics, and floors. By using proper insulation, homeowners can save on energy bills and create a more comfortable living environment. Additionally, effective insulation contributes to environmental sustainability by reducing the need for heating and cooling systems, which often rely on fossil fuels.