To me, advertising photography covers a lot of things, but basically it is an image created to help you gain more business. This could be images of fitness equipment in use, a portrait for a billboard, the super cool new manufacturing machine in a factory, product pictures, a new store location, piping being installed in a coal mine...well you get the idea. My job is simple, create some awesome images that make your prospective customer take action. While staying within your budget. And your deadline. :)