Asbestos is a mineral fiber that was commonly used in construction materials due to its strength and heat resistance. However, it was discovered that long-term exposure to asbestos fibers can cause serious health problems, including lung cancer, mesothelioma, and asbestosis.

Since the dangers of asbestos were recognized, the use of asbestos in building materials has been banned. But many older buildings still contain asbestos, which is why it's important to have a professional asbestos survey and removal.