Photoshop has done more to change the nature of photography than any other tool.
Instead of hand-altering images, editors can endlessly tamper with them on a computer screen. This is most often see in ads and magazine covers, which has led critics to say that digital "perfectionism" is destroying America's body image.
The software was first created by Thomas and John Knoll in the late 1980s, and was then sold to Adobe in 1990.
According to Merriam-Webster, the first known use of "Photoshop" as a verb when talking about changing photos occured in 1992. This wouldn't have been possible without Adobe's landmark photo-editing software.
In this picture, a burger is photographed for a Canadian publicity shoot. The burger on the left, after some real-life alterations by on-set crew, was Photoshopped into the burger on the right.