A screen door is a type of door that is designed to allow fresh air to enter a building while keeping insects and debris out. It typically consists of a frame made of wood or metal, with a mesh screen stretched across it. Screen doors are commonly used in homes, especially during warmer months, to provide ventilation without compromising on comfort. These doors can be installed as a primary entrance or as an addition to an existing door, such as a front door or patio door. Some screen doors come with features like retractable screens or magnetic closures, making them convenient and easy to use.