Insulation is a material used to reduce the transfer of heat, sound, or electricity. It helps keep homes warm in winter and cool in summer by preventing heat from escaping or entering. Common types of insulation include fiberglass, foam, and cellulose, which can be found in walls, attics, and floors. In addition to improving comfort, insulation can also save energy and lower utility bills. By using insulation effectively, homeowners can reduce their reliance on heating and cooling systems, making their homes more energy-efficient. This contributes to a healthier environment by decreasing greenhouse gas emissions from power plants.