Which of the following is an example of a Video Input Device?

A webcam is a device specifically designed to capture video input. It functions by taking images in real-time and converting them into a digital format, which is typically used for video conferencing, streaming, or recording. Webcams often have built-in microphones and are commonly utilized for personal communication over the internet, such as through video calls or livestreaming.

The other options do not serve the purpose of capturing video input. A printer outputs printed materials but does not take in video. An external hard drive serves as a storage device for digital files including videos, but it doesn't capture video footage. A keyboard is an input device that allows users to enter data into a computer but does not handle video input. This distinction makes the webcam the clear example of a video input device.