Auditory Brainstem Response (ABR) is a test that measures the brain's electrical activity in response to sound. It is commonly used to assess hearing ability, especially in newborns and individuals who cannot communicate their hearing status. During the test, small electrodes are placed on the scalp and earlobes while sounds, such as clicks or tones, are played through headphones. The ABR test evaluates how sound travels from the ear through the auditory nerve to the brainstem. The results help identify hearing loss and can guide further evaluation or treatment. It is a non-invasive and painless procedure, making it suitable for patients of all ages.