Question

which one is not an externel hardware
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Answer 1

Monitor , keyboard , mice , printers and scanners ....

Answer 2

External may refer to any of the following:

1. In general, external refers to anything outside of a location.

Computer inkjet printer
2. External describes a hardware device that's installed outside of the computer. For example, a printer (shown in picture) is an external device because it connects to the back of the computer and is outside the case. However, a video card is an internal device since it is found inside of the computer case.

External hardware examples

eGPU
Flash drive
Flat-panel, Monitor, and LCD
Hard Drive
Headphones
Joystick
Keyboard
Mouse
Printer
Projector
Scanner
Speakers
USB drive
3. With software an external file is anything outside of the file currently loaded. For example, an external CSS or JavaScript file is a file that can be loaded from the HTML page being viewed. By loading an external file, you can keep long scripts or other code outside of the current one and use with additional ones.