A headphone splitter is a small device that allows multiple users to listen to audio from a single source, such as a smartphone, tablet, or computer. It typically has one male connector that plugs into the audio jack and two or more female jacks for connecting headphones. This is useful for sharing music, movies, or games with friends without needing multiple devices. These splitters come in various designs, including simple Y-shaped models and more complex versions with volume controls. They are compatible with most standard headphones and are often used in settings like classrooms, travel, or casual gatherings, enhancing the shared listening experience.