A storm door is an additional door installed in front of an exterior door, designed to protect against harsh weather conditions. It typically features a durable frame and can be made from materials like aluminum or fiberglass. Storm doors often have glass panels that can be replaced with screens, allowing for ventilation while keeping out rain and wind. These doors help improve energy efficiency by providing an extra layer of insulation, which can reduce heating and cooling costs. They also enhance the security of the home by adding another barrier against intruders. Many homeowners choose storm doors for their practicality and aesthetic appeal.