The first meaning of adapter that mentions the Royal Spanish Academy (RAE) refers to adjective employee to qualify what adapts (that is, that adjusts or adapts something to something else). The term is often used as noun alluding to the object that allows mold or condition elements of different design or use.

A network adapter, also called network card or network card, is used for a computer (computer) to connect to a network and thus be able to share certain resources. A video adapter or display adapter (known even as video card or Graphic card), meanwhile, it has the function of developing the processing of the data that comes from the CPU to convert them into information that a monitor can understand and represent.
On many consoles video game adapters can be connected for increase joystick connection capacity (joysticks). Thus, instead of connecting a single joystick to the corresponding port, an adapter is plugged in that enables the connection of two or four joysticks so that multiple people can play simultaneously.
Is named ac adapter to an external power appliance that is generally used with devices that lack an internal power supply. There are adapters of universal use that serve for different products since it is possible to select the voltage, the polarity and other parameters.
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