Photoshop is a graphics editing program used to create and modify digital images. It was created in 1988 by Thomas and John Knoll and can be used for tasks like photo retouching, image manipulation, and graphic design. Digital images are made up of tiny colored squares called pixels that combine to form the full image. Photoshop uses RGB color channels, with each channel having 256 shades, to produce over 16 million possible colors in an image. It remains the leading software for image editing and is part of the Adobe Creative Suite.