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A product manager is a person who defines the product and knows how the products are. The role of a PM exists as it deals with shipping quality products to the users. Product managers are obsessed with user research and feedback to ensure the products meet specifications for users without compromising quality. The responsibilities of a product manager vary from company to company, and their roles are based explicitly on how large a team is. According to Glassdoor, a Product Manager's average salary is around the $127k range.