The Jack connector is one of the most widely known and frequently used connectors in the music industry and is largely used to connect electronic musical instruments and amplifiers. They are sometimes referred to as TRS connectors, which stands for Tip / Ring / Sleeve, where the tip is the end of the male connector, the ring is the central section between the two plastic dividers, and the sleeve is the remaining metal part of the male connector. Each part of the male connector is electrically isolated from the others, allowing a connector to carry more than one signal. The female connector, on the other hand, receives the male connector, which is held in place with a relatively reliable mechanical system.
They are available as mono jacks (single channel, TS) or as stereo jacks (dual channel, TRS). However, three-channel versions (TRRS) are also available when video signals are also required.
In addition to the 6.35 mm jack connectors, the 3.5 mm (1/8") ones called mini-jacks are also widely used. These connectors are widely present in home and commercial applications and in Hi-Fi installations.