Asbestos is a highly toxic substance that was commonly used in building materials throughout the 20th century. It was used for its durability, strength, and resistance to fire and heat. However, asbestos fibers are extremely hazardous to human health and are known to cause a range of respiratory illnesses and cancers, including mesothelioma, lung cancer and asbestosis. Asbestos can be found in a variety of building materials such as insulation, floor tiles, roofing, and cement, making it important to identify its presence to avoid any danger.