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Two main input devices on a computer are:

Keyboard: A keyboard is a standard input device that allows users to input text, numbers, and commands into a computer. Keyboards usually have a standard layout of alphanumeric keys, function keys, navigation keys, and modifier keys that allow users to type quickly and efficiently.

Mouse: A mouse is another common input device that allows users to move a cursor or pointer on the screen and interact with graphical user interfaces (GUIs). A typical mouse has one or more buttons that can be used to select items on the screen, and a scroll wheel that can be used to navigate content.

Two main output devices on a computer are:

Monitor: A monitor is the primary output device on a computer, and it displays text, images, and video on the screen. Monitors come in different sizes and resolutions, and they can be CRT, LCD, or LED-based.

Printer: A printer is an output device that allows users to print text and images onto paper or other media. There are different types of printers, including inkjet, laser, and dot matrix printers, and they can be used for different applications such as printing documents, photos, or labels.

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