Visualization consists of using any variety of tools for assisting interested stake holders to picture what a building or space will look like prior to completion of a building. The first types of visualization tools included hand sketches and renderings. Mediums today include any number of two and three dimensional rendering techniques including virtual reality.
Why Photoshop and similar software is a large component of architectural design.
It may not seem obvious that architects and other professionals in the field would need to work with visual design software such as Photoshop, however using Photoshop can be a game changer for your profession.