A terminal in accordance with one exemplary embodiment of the present disclosure includes a terminal body, a substrate mounted onto the terminal body, and a socket module coupled to the substrate to transfer an electrical signal by being electrically connected to an inserted plug, and the socket module includes a housing having an opening at one surface thereof, the plug being inserted into the opening, and a coupling unit formed at at least one side of the housing, and slidable with respect to the substrate upon being coupled to the substrate. This may allow a substrate assembly coupled with the socket module to become slimmer by a thickness of the substrate, resulting in providing a more size-reduced terminal.