A product manager investigates, selects, and develops products for an organization, performing the activities of product management.
A product manager considers numerous factors such as intended demographic, the products offered by the competition, and how well the product fits with the company’s business model. Generally, a product manager manages one or more tangible products. However, the term may be used to describe a person who manages intangible products, such as music, information, and services. (Source: Wikipedia.org)