A crawl space is a narrow area beneath a building, typically between the ground and the first floor. It provides access to plumbing, electrical wiring, and insulation, making maintenance easier. Crawl spaces are usually ventilated to prevent moisture buildup, which can lead to mold and structural issues. These spaces can vary in height, often just a few feet tall, and are commonly found in homes built on piers or foundations. Properly maintained crawl spaces can help improve air quality and energy efficiency in a home, while poorly managed ones can lead to problems like pest infestations and water damage.