Asbestos is a naturally occurring mineral that was widely used in various construction materials, especially during the 20th century. It was used in the construction of buildings, factories, homes, and schools, among others. It was popular due to its excellent heat and fire-resistant properties, making it a reliable construction material.

However, in the 1970s, it was discovered that exposure to asbestos could lead to serious health complications. When asbestos fibers are inhaled, they can get lodged in the lungs, leading to lung cancer, asbestosis, and mesothelioma, among others.