Interaural level difference (ILD) refers to the difference in sound intensity that reaches each ear when a sound originates from one side of the head. This phenomenon occurs because the head creates a sound shadow, causing the ear closer to the sound source to receive a louder signal than the ear farther away. ILD is an important cue for human auditory localization, helping individuals determine the direction of sounds in their environment. The brain processes these differences in sound levels to identify the location of the sound source, enhancing our ability to navigate and respond to auditory stimuli.