Asbestos is a natural mineral fiber that was used commonly in the construction industry between the 1940s and the 1970s. It was used mostly for insulation, fireproofing, and soundproofing purposes. It's made up of several different types of minerals, including chrysotile, crocidolite, and amosite. These minerals are durable, heat-resistant, and have strong insulating properties that made them attractive to builders.

However, over time, it was discovered that these materials could cause severe health problems. Asbestos fibers are tiny, sharp particles that can become lodged in the lungs when inhaled. These fibers can create scar tissue, which can lead to the development of mesothelioma, lung cancer, and other lung diseases. The harmful effects of asbestos exposure can take several years to develop, and unfortunately, there are no effective treatments once the damage is done.