Asbestos is a naturally occurring mineral that was widely used in building materials during the 20th century. It's composed of thin, fibrous crystals that can easily break into tiny particles when disturbed. Asbestos was prized for its fire-resistant, soundproof, and insulating qualities. It was commonly found in products such as ceiling tiles, insulation, roofing, piping, and flooring.

However, it wasn't until the 1970s that researchers discovered the link between asbestos exposure and serious health problems. Since then, its use has been heavily regulated and even banned in some countries. Unfortunately, asbestos is still present in many buildings built before the 1980s, putting workers and residents at risk.