Hearing loss can have many meanings and definitions. It refers to an inability to hear sounds within a typical range without assistance. Hearing loss is measured by intensity and frequency of sounds a person can hear. There are different types of hearing loss including conductive, sensory, and mixed. Degrees range from mild to profound. Causes include ear infections, genetic conditions, aging, and loud noise exposure. Hearing loss impacts language development and academic performance in children. While many with hearing loss can speak, sign language is the primary language for some. Technologies like hearing aids and cochlear implants can help but do not restore normal hearing. Communication methods include lip reading, sign language, and assistive devices.