Digital art is described as an artistic work or practice that uses digital technology as an essential part of the creative or presentation process and is only limited by your imagination.
This can comprise of a photo taken by a digital camera or printed photo which has been digitally scanned. In fact, anything that can be scanned can also be blended in. Images such as ink splats, scribbles, watercolours, daubs of paint, material, flowers.
The resulting image can then be enhanced with text, creative brushes, blurring and even effects that are available to film such as dodging and burning, solarization.
Like art, there are so many genres from photo-realism to Surrealism. Neoclassical to cubism.