Asbestos is a naturally occurring mineral that was widely used in building materials in the past. It's an ideal material for insulation, fireproofing, and soundproofing due to its strength, durability, and heat-resistant properties. However, asbestos is a dangerous material that can cause serious health issues, including cancer, mesothelioma, and asbestosis. When asbestos-containing materials are disturbed, such as during construction or renovation work, they can release asbestos fibers into the air, which can be inhaled and cause serious health problems.