What Is an Audio Jack?
Audio jacks are connectors used for linking audio devices.
Available in 3.5 mm or 6.35 mm diameters, audio jacks are suitable for either stereo or monaural connections. Stereo connections separate the left and right audio channels for a richer sound, while monaural connections combine them.
Audio jacks are commonly found in smartphones, tablets, computers, and MP3 players, although newer devices may use alternatives like Bluetooth or USB-C.