The unit used to express the intensity of sound is the decibel (dB). Decibels measure sound pressure level, representing the logarithmic ratio of a sound’s intensity relative to a reference intensity. Sound intensity can significantly affect human hearing and overall auditory health. Understanding sound intensity is important in various fields, including acoustics, audio engineering, and environmental science. High decibel levels can lead to hearing damage, making awareness of sound exposure crucial for public health and safety.