Headphone jack

A headphone jack is a small, cylindrical socket on electronic devices like smartphones, computers, and music players, where you can insert headphones or earphones. It transmits the audio signals from the device to the headphones, allowing you to listen privately. The standard size is typically 3.5 mm, meaning the diameter of the jack is 3.5 millimeters. This connection facilitates high-quality sound transfer, making it easy to enjoy music, calls, or other audio content without external speakers. Although some devices are moving toward wireless options, the headphone jack remains a simple, reliable method for audio connectivity.