Asbestos is a fibrous, heat-resistant material that was commonly used as a building material in the past. However, it has been known to cause serious health issues, including asbestosis, lung cancer, and mesothelioma. Asbestos fibers can easily be inhaled and lodged in the lungs, leading to long-term health problems and even death.

As a result, asbestos has been banned from use in construction in many countries since the 1990s. However, buildings constructed prior to this time often contain asbestos, especially in the form of insulation and ceiling tiles.