Product photography is a branch of commercial photography which is about accurately but attractively representing a product. The principal application of product photography is in product catalogues and brochures, with a proportion of product images also being used in advertising.
Architectural/ Real Estate photography is the photographing of buildings and similar structures that are both aesthetically pleasing and accurate representations of their subjects. Architectural photographers are usually skilled in the use of specialized techniques and equipment.
A head shot or headshot is a specific type of portrait (usually a photograph) that realistically demonstrates a person's appearance for branding or casting. Many head shots are promotional pictures of actors, models, authors. Headshots could be a portrait of a face or full body with a background that clearly illustrate the personality inside the person photographed.
Commercial photography is photography which is shot for a commercial purpose, typically for use in commercial offset litho printing or in advertising. Commercial photography generally has the end purpose of selling some product or service, and is most commonly commissioned by a marketing agency or department