A controller, in a computing context, is a hardware device or a software program that manages or directs the flow of data between two entities. In computing, controllers may be cards, microchips or separate hardware devices for the control of a perip...See more
heral device. In a general sense, a controller can be thought of as something or someone that interfaces between two systems and manages communications between them.
Here are a few examples of controllers:
A graphics card is an integrated circuit card in a computer or, in some cases, a monitor that provides digital-to-analog conversion, video RAM, and a video controller so that data can be sent to a computer's display.
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