What are Plugs and Sockets?
A plug is a moveable connector, usually attached to a cable. A socket is the fixed product that is attached, usually to a wall or floor, the the plug is inserted into.
In the UK the most common plug type is the 13 amp three pin. These are rectangular pins that fit into the three pin 13 amp socket. There are a number of other sockets, including a 5 amp sockets, usually used for plugging lights into lighting circuits.
You also now often also get USB plugs and sockets, for connecting cable to technology for recharging. The most common type are USB A, B and C.