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What Are the Differences between a Plug and Socket?

Sandi Johnson
Sandi Johnson

The precise difference between a plug and socket varies, depending on the specific industry and country of origin. Generally, plugs have prongs that fit into slots in a socket. Pins, prongs, or other protrusions on a plug are called male ends. Slots, holes and other receptacles on a socket are called female ends. Typically, sockets are fixed in place, such as in a wall or other permanent fixture. Alternatively, a plug is movable, attached to an appliance, electronic device or other portable mechanism.

In computer electronics, the difference between a plug and socket can be slightly different than electrical outlets or receptacles. For example, a monitor plug is comprised of numerous pins that fit into a socket or port on the back of a computer processing unit (CPU.) Likewise, CAT5 cables, used to connect computers to routers and modems, have a plastic plug comprised of several wires housed inside a plastic clip. CAT5 plugs fit into a recessed socket at the back of the router or modem and snap into place via the plastic clip.

Cat 5 cable with RJ45 plug.
Cat 5 cable with RJ45 plug.

Aside from the differences of placement and general physical appearance, specific applications can result in a variety of differences between a plug and socket. Some applications, in an effort to protect people and equipment from electrical hazards, necessitate specific physical differences. Grounding, for example, may require a plug to have three or more prongs in a set pattern. Only sockets with slots or holes situated in an identical mirrored pattern can accept such plugs.

220 volt europlug.
220 volt europlug.

Various plug and socket configurations, and their appropriate appearances and differences, vary from country to country. They can differ in nomenclature, physical characteristics, and required features. Terms such as plug and socket, or power cord and outlet, have different meanings and characteristics depending on American or European standards. Regardless of industry or country of origin, understanding the differences between the two merely requires understanding that each component is symbiotic with the other. Plugs fit into sockets to connect two parts, typically to complete an electrical circuit or create a network of interconnected devices. Each component is fashioned to accept connection to its matching counterpart.

230 volt grounded British plug.
230 volt grounded British plug.

With this concept in mind, a plug and socket can be seen as two removable parts of a whole. A socket can be thought of as a negative image of its matching plug, with recesses in the socket to accommodate protrusions in the plug. How each component compares or illustrates differences depends on whether the components are for electrical devices, computer equipment, manufacturing facilities, or another application.

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Discussion Comments


The majority of the sockets in our house are the older ones that are designed for appliances and electrical devices that have two prong plugs. This is inconvenient since so many of the newer electrical devices you buy do have three prong plugs.

Fortunately, we are able to plug in surge protectors in the few three prong outlets we have and then we can plug in several three prong plugs into the sure protector sockets. By doing this we are able to plug in our computers and printer and a few more items at the same wall outlet.

Eventually, we are going to replace all of the two hole sockets with the ones that will take three prong plugs. This makes more sense in the long run. If we ever decided to sell the house, the two hole outlets would be a negative for buyers. I think they make people think that the wiring must be out of date, and maybe dangerous.


@Laotionne - With electric heaters, the manufacturer usually mentions whether the heater is safe to use with an adapter or not. Actually, I don't think you are supposed to use an extension cord with any of them, and I am not certain about the adapter. However, I bet if you look at the directions and instructions that came with the heather then you'll know for certain.


I bought one of the new style nice electric heaters to use in addition to my primary heating system in my apartment. The heater has a thermostat with the numbers displaying on a little screen. When I set the heater on 68 degrees, the number 68 is displayed on the screen, so I know exactly what temperature the heater is set on.

By using the heater, I can leave my primary heating system on a lower temperature setting during the winter and save money during the really cold months. The heater has a three prong plug on the power cord, and I want to plug it into an outlet with only two holes. Is it okay to use an adapter for a heater of this kind?

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    • Cat 5 cable with RJ45 plug.
      Cat 5 cable with RJ45 plug.
    • 220 volt europlug.
      By: Lusoimages
      220 volt europlug.
    • 230 volt grounded British plug.
      By: ibphoto
      230 volt grounded British plug.
    • 110 volt grounded American plug.
      By: carroteater
      110 volt grounded American plug.