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 source and two or more female jacks for connecting headphones. This is useful for sharing music, movies, or games with friends without needing multiple devices. Headphone splitters come in various designs, including those with two, three, or even more outputs. They are often compact and portable, making them convenient for travel or group activities. Some models may also include volume controls for each output.