The document discusses the history and evolution of Adobe Photoshop from its initial release as Photoshop 1.0 to the current version Photoshop CS4. It outlines key additions to the software at different stages like the gradient tool and magic wand in Photoshop 2.0 and improvements to layers, history palette and clone tool in Photoshop 5.0. It also lists common uses of Photoshop including vector art, magazine covers and photo retouching as well as career paths that utilize Photoshop skills such as web design, advertising and graphic design.