As Wikipedia says...
With computers and digital cameras, image editing encompasses everything that can be done to a photo. Photo manipulation is often more explicit than subtle alterations to color or contrast and may involve overlaying a head onto a different body or changing a sign's text. Image editing software can be used to apply effects and warp an image until the desired result is achieved. The resulting image may have little or no resemblance to the original photo. Photo manipulation is widely accepted as an art-form.
Wikipedia sums it up quite nicely,
but I'll add...
Image editing involves the process of altering images.
Graphic software programs are the primary tools with which a user may manipulate, enhance, and transform images.
Adobe Photoshop is a graphics editing program and has been described as “an industry standard”. Photoshop allows users to push the boundaries of visual experience. Every day, users turn to Photoshop applications.
If you can imagine it, Photoshop can help you achieve it. It's an amazing program!
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