Asbestos is a naturally occurring mineral that was commonly used in the construction industry from the 1950s to the 1980s. It was popular due to its durability, flexibility, and heat resistance. However, it was later found to be highly toxic, causing lung cancer, mesothelioma, and asbestosis. The substance was banned in the UK in 1999, but many buildings constructed before then still contain asbestos-containing materials (ACMs).