Generally speaking, it's anythign that is not attached to the computer itself normally (like a hard drive, CPU etc.) and must interface with the computer another way such as through USB cables, speaker cables, bluetooth connections or any other kind of cable/wireless connection. Examples would be keyboards, speakers, bluetooth speakers, audio interfaces or external sound cards.
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Peripheral devise are the computer devices that are connected to the computer externally such as printer, scanner, keyboard, mouse, tape device, microphone and external modem. They can be internal such as CD-ROM or internal modem and external as the scanner, printer and Zip drive. Peripheral devices can be classified according to their functions.InputInput devices are the type of the computer devices that are used to provide the control signals to the computer. Keyboard and the Mouse are the examples of the input devices.OutputOutput devices are the devices that are used to display the results. Printer, scanner, speaker and the monitor are the examples of the output devices.StorageA storage device is a device that is used to store the information such as hard disk drive, flash drive, floppy disk and the tape drive.
A USB drive is a device that stores data and could be considered either an output or input device, though not in the sense of a monitor or speakers being an output device or a keyboard and mouse an input device. The data it contains cannot be directly accessable by the human senses in those same terms.
...The door? The refrigerator/freezer (though it requires a manual interface, in which you take the food out of the freezer and put it in the microwave by hand). Also, the buttons on a microwave might be considered an input device. There is no microwave input device in terms of home computers (with the possible exception of a hack that allowed you to control it via USB or something, but I've never heard of that being done). A cell phone or Blue Tooth device might be considered a "microwave device," or maybe a 3G or 4G device such as an adapter or hub. That frequency range of radio waves is considered microwave energy.
a device that can do work
Yes, terms of service are considered a contract between a user and a company.
Voltmeter is a device to measure EMF and potential difference in terms of volts Thermometer is a device to measure the temperature in terms of K(kelvin),C(Celsius) F(Fahrenheit)
PCI stands for Peripheral Component Interconnect, it is a type of architecture connectors used by different components.
Cysteine is considered hydrophilic in terms of its chemical properties.
Limes are considered acidic in terms of their pH level.
An egg is considered to be slightly basic in terms of its chemical composition.
The animal considered the best in terms of adaptability and survival skills is the cockroach.