A door sweep is a strip of material attached to the bottom of a door. Its primary purpose is to seal the gap between the door and the floor, preventing drafts, dust, and pests from entering a room. Door sweeps can be made from various materials, including rubber, vinyl, or bristle, and they come in different sizes to fit various door types. Installing a door sweep can improve energy efficiency by reducing heating and cooling costs. It also helps maintain indoor air quality by keeping out allergens and pollutants. Overall, a door sweep is a simple yet effective solution for enhancing comfort in any space.