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Speakers play sound louder or softer than computer audio.

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Printers print stuff. Images, text, etc.

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DLP projects color through the screen

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Plasma another type of lighting

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OLED uses organic material to light the display

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LED uses back lighting to light the display

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LCD it sends electricity to crystals in certain areas so light can or can't pass through.

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Smart card readers lets you pay for stuff

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Digital cameras

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Touchscreens just make you be able to select what to do without a mouse and courser and sometimes remove the keyboard so you can type on it.

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Keyboards type what letter you click meaning instead of writing you can quickly type it.

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Mice move your cursor or "arrow."

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Joysticks are not really used for gaming nowadays but they are sometimes used for simulation type stuff.

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Gamepads are used for gaming on PCs by console controller standards.