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Product marketing
Product Marketing deals with the first of the "4P"'s of marketing, which are Product, Pricing, Placement, and Promotion. Product marketing, as opposed to product management, deals with more outbound marketing tasks. 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 Marcom or marketing communications, online marketing, advertising, marketing strategy, etc.
http://en.wikipedia.org/wiki/Product_marketing
Positioning (marketing)
A product's position is how potential buyers see the product. Positioning is expressed relative to the position of competitors. The term was coined in 1969 by Al Ries and Jack Trout in the paper "Positioning" is a game people play in today’s me-too market place" in the publication Industrial Marketing. It was then expanded into their ground-breaking first book, "Positioning: The Battle for Your Mind".
Positioning is something (perception) that happens in the minds of the target market. It is the aggregate perception the market has of a particular company, product or service in relation to their perceptions of the competitors in the same category. It will happen whether or not a company's management is proactive, reactive or passive about the on-going process of evolving a position. But a company can positively influence the perceptions through enlightened strategic actions.
In marketing, positioning has come to mean the process by which marketers try to create an image or identity in the minds of their target market for its product, brand, or organization. It is the 'relative competitive comparison' their product occupies in a given market as perceived by the target market.
http://en.wikipedia.org/wiki/Positioning_%28marketing%29