3.5mm audio jack

A 3.5mm audio jack is a common connection port used to transmit stereo sound between devices such as smartphones, headphones, and computers. It consists of a small, circular plug with three metal sections: one for the left audio channel, one for the right audio channel, and a shared ground. This allows for high-quality audio to be transferred easily and reliably. The 3.5mm size is widely adopted because it is compact, cost-effective, and compatible with many audio devices, making it a standard for personal audio connections worldwide.