Crop means how big an image or even to eliminate non-essential facets of a picture. For Example, you might have a picture of many individuals, but may just wish to have a picture of 1 person from that picture. Then utilizing the harvest function and creating a choice around that person makes an image of just that individual.
Since the advent of widescreen television, a similar process removes large chunks from the top & bottom to make a standard 4:3 image fit a 16:9 one, losing 25% of the original image.
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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.