A door sweep is a simple yet effective weatherproofing accessory installed at the bottom of a door. It typically consists of a long strip made of rubber, vinyl, or bristles that seals the gap between the door and the floor. This helps prevent drafts, dust, and moisture from entering a building, improving energy efficiency and comfort. In addition to energy savings, a door sweep can also enhance security by making it harder for pests to enter. They come in various sizes and styles to fit different types of doors, including interior doors and exterior doors, ensuring a snug fit for optimal performance.