Cropping lets you select the exact area of an image you want and cut away everything outside it — handy for removing stray elements at the edges, fixing the aspect ratio, or focusing attention on what matters.
For example: You need to remove extra background from a screenshot before dropping it into a presentation — set the crop area in pixels and get a cleanly trimmed image.
Who uses it most: Designers, presentation authors, teachers, content managers
Yes — X/Y position and crop dimensions are entered in pixels manually, for a precise result instead of eyeballing it.
No — cropping doesn't re-compress or alter pixels inside the selected area, it just removes what's outside it.