A door seal is a flexible strip designed to fit along the edges of a door frame, ensuring a tight closure between the door and the frame. Its primary purpose is to prevent drafts, dust, moisture, and sound from entering a space. Usually made of rubber or similar resilient materials, the door seal provides insulation and energy efficiency by sealing gaps that might otherwise allow air to escape or enter. This specific door seal is a long, pliable piece, likely intended for easy installation on various door types, enhancing comfort and reducing energy costs in homes and buildings.