Product marketing deals with the first of the "7P"'s of marketing, which are Product, Pricing, Place, Promotion, Physical Environment, Process & People.
Product marketing, as opposed to product management, deals with more outbound marketing tasks (in the older sense of the phrase). For example, product management deals with the nuts and bolts of product development within a firm, whereas product marketing deals with marketing the product to prospects, customers, and others. Product marketing, as a job function within a firm, also differs from other marketing jobs such as marketing communications ("marcom"), online marketing, advertising, marketing strategy, public relations, etc.
A Product market is something that is referred to when pitching a new product to the general public. The people you are trying to make your product appeal to is your consumer market. For example: If you were pitching a new video game console game to the public, your consumer market would probably be the adult male Video Game market (depending on the type of game). Thus you would carry out market research to find out how best to release the game. Likewise, a massage chair would probably not appeal to younger children, so you would market your product to an older generation.
Product market definition focus on a narrow statement. It focuses on the product type, customer needs (functional needs), customer type, and geographic area.