Asbestos is a fibrous material that was commonly used in construction, particularly during the 20th century. It was used for insulation, roofing, and other building materials, as it is heat-resistant, durable, and fire-retardant. However, asbestos is also highly toxic and poses a serious health risk when its fibers are inhaled or ingested.

Exposure to asbestos can lead to serious health problems, such as lung cancer, mesothelioma, and asbestosis. This is why it's crucial to dispose of asbestos-containing materials properly and with caution.