IEC 60320 Appliance couplers for household and similar general purposes is a set of standards from the International Electrotechnical Commission (IEC) specifying non-locking appliance and interconnection couplers for connecting power supply cords to electrical appliances up to 250 volts. Different types of connector (distinguished by shape and size) are specified for different combinations of current, temperature and earthing requirements. Unlike IEC 60309 connectors, they are not coded for voltage; users must ensure that the voltage rating of the equipment is compatible with the mains supply.
The IEC 320 standard was developed so that product manufacturers can utilize an inlet on their devices that will be supported in all countries in the world, and therefore, make designing products for international use much easier.
In the IEC 60320 standard, there are plugs, connectors, outlets, and inlets.
Plug : The plug is the male end of the cable (the end with pins/prongs/blades). In the IEC 60320 standard, the male end will also be an even number... i.e. C14, C20.
Connector : The connector is the female end of the cable. In the IEC 60320 standard, the female end is an odd number.. i.e. C5, C7, C13, C15, C19, C21
Outlet/Receptacle : An outlet is found on a wall or PDU, and is where you plug in the cord set. The outlet is female.
Inlet : An inlet is found on a device and is where the cord connector plus into the device. The inlet is male.