What is an Image?
An image can be two different things in a computer: anything that you can see that can be displayed on a screen, including photos, graphics, drawings, icons, etc., as well as the image files that contain the data necessary to display said images—computer image data is generally composed of pixels (in formats such as BMP, PNG, JPG, GIF, WEBP), but there are others kinds, such as vector images (e.g. SVG) as well; the term may also refer to optical disk image files, or ISO files, which contains the image to be burned into an optical disk (CDs, DVDs, Blu-rays, etc.), although nowadays we generally use USB sticks for that, which aren't optical, so they aren't really images anymore, but we still call them images nonetheless.
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