From Wikipedia

Adobe Photoshop, or simply Photoshop, is a graphics editing program developed and published by Adobe Systems. It is the current and primary market leader  for commercial bitmap and image manipulation, and is theflagship product of Adobe Systems. It has been described as “an industry standard for graphics professionals”  and was one of the early “killer applications” on the PC.

Adobe’s 2005 “Creative Suite” rebranding led to Adobe Photoshop 8′s renaming to Adobe Photoshop CS. Thus, Adobe Photoshop CS4 is the 11th major release of Adobe Photoshop. The CS rebranding also resulted in Adobe offering numerous software packages containing multiple Adobe programs for a reduced price. Adobe Photoshop is included in most of Adobe’s Creative Suite offerings.

Due to its popularity, “photoshop” has become both a verb to refer to photo editing and a genericized trademark for graphics editing software. Photoshop’s popularity, combined with its high retail price, makes Photoshop’s piracy raterelatively high.  Adobe countered by including SafeCast DRM starting with Adobe Photoshop CS.
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