In American English and when speaking about electrical circuits and devices, a "socket" is something into which a light bulb is screwed, while an "outlet" is something into which electrical cords are plugged.

Is a socket the same as a plug?

A plug is the movable connector attached to an electrically operated device, and the socket is fixed on equipment or a building structure and connected to an energised electrical circuit. The plug is a male connector, often with protruding pins that match the openings and female contacts in a socket.

What do you call an outlet?

Electrical outlets (also known as outlets, electrical sockets, plugs, and wall plugs) allow electrical equipment to connect to the electrical grid.