The resolution of an image is the amount of pixels within an area. Pixels are a collection of millions of dots to create an image. The brain assembles the all these dots into an image. When there is a low resolution, the number of pixels is lower and this can result in having an unclear image where the individual pixels may be able to be seen.
In TV, at least 25 images are shown every second. This is enough for the brain to interpret the images in succession as an actual moving image. Each of these individual images in known as a frame.
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