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A 3.5mm audio port on a computer is a small, round analog connector used to send and receive audio signals to peripheral devices like headphones, speakers, and microphones. Desktop computers often have several 3.5mm ports, which are usually color-coded according to a standard to indicate their function. Desktop computer 3.5mm ports typically located on the back of the tower, and sometimes on the front for convenience, desktop 3.5mm ports follow a color-coding convention.

Pink: Microphone input. Used to connect a microphone for voice recording or communication.

Lime Green: Stereo line-out. This is the main output for speakers and headphones.

Light Blue: Stereo line-in. Used to bring audio from an external source, such as a phone or another audio device, into the computer for recording or playback.

Black: Rear speaker out. For multi-channel audio setups (e.g., 5.1 surround sound).

Orange: Center speaker and subwoofer out. Also for multi-channel audio.

Gray: Side speaker out. For multi-channel audio.