Webcams fall into an ill-defined area between digital cameras and video camcorders.
The first reason is that some consumers can easily identify with a product that has its resolution described in megapixels as opposed to HD resolution and vise versa.
The other reason for the two different descriptions for video resolution is a separate measurement: the aspect ratio.
When it comes to a webcam that has a normal aspect ratio, you are more likely to see the resolution listed in terms of megapixels.
When you see a webcam for which the video resolution is listed in megapixels, expect the picture to be as tall as it is wide.
This webcam has a normal aspect ratio, but this one has a 16:9 aspect ratio.
At this point, you may be wondering, like the Double Rainbow Guy What does all this mean?
The software that comes with the webcam is what digitally enhances the quality of the pictures.
When you see that a webcam can take up to 20MP interpolated photos, it actually means that the webcam itself doesn't have that capability, but the software can upgrade the quality of the photos to 20MP.
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