Definition - What does Letterboxing mean?
Techopedia explains Letterboxing
In order to make the wide image fit onto a smaller screen, it must be scaled down until both sides fit within the smaller aspect ratio. Since the image is a rectangle, this means that there are now areas on the top and bottom of the image that are blank. The most logical way to address this issue is to make these areas black so that they can be largely ignored.
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