A headphone jack is otherwise known as a phone connector, audio jack, phone jack, or jack plug. It is a member of a family of electric connector generally used for dealing with analog signals, including audio.
A headphone jack has a cylindrical shape, usually with two to five contacts. As with the history of a headphone jack, it was invented with the purpose for use with telephone switchboards back in the 19th century. Down to this day, it is still used widely. [Read more…]