Several types of phone jacks and plugs are commonly available. In the United States, telephone jacks are called registered jacks (RJ), licensed with the Federal Communications Commission (FCC), and ...

In shell-type, multiple-contact connectors, the plug usually contains the socket contacts and is mounted on the "hot" (rack) side of the system. Plugs mate with receptacles, jacks, outlets, etc.

Also called a 3.5mm or 1/8" connector, it is a plug and socket widely used for analog audio signals in portable devices. For example, the headphone jack on iPods, tablets and portable DVD players ...