A sound measured at 100 decibels is considered very loud. This level of sound can be compared to the noise produced by a chainsaw or a rock concert. Prolonged exposure to sounds at this volume can potentially cause hearing damage, making it important to use hearing protection in such environments. In everyday life, sounds around 100 decibels can be encountered in various situations, such as when standing close to a lawnmower or during a fireworks display. It is advisable to limit exposure to these loud sounds to protect your hearing health.