Further Categories:

2.5mm Stereo
2.5mm stereo cables and adapters, found on some mobile phones.
3.5mm Stereo 3.5mm Stereo
3.5mm stereo accessories. More Commonly known as the standard headphone socket found on iPods.
6.35mm Stereo 6.35mm Stereo
Cables and adapters for use with the large 6.35mm stereo socket.
Optical Audio (SPDIF) Optical Audio (SPDIF)
Optical audio cables and adapters for connecting digital audio devices.
RCA accessories commonly used to connect audio and video equipment.
Speaker Speaker
Cables and adapters used to connect speakers to stereo systems.