What is Product Management?
Product Management is the practice of strategically driving the product development, product marketing, and continual support and improvement of products.
Product management is the heart of every product. Product Manager is the owner of the Product Management team. The core responsibility of a product manager is to build the strategy, roadmap, and feature definition for that product.

Product management is mostly divided into two parts:
Strategic Product Management
Strategic product management encompasses all strategic aspects and tasks required to make an existing or future product successful.Technical Product Management
Technical product management includes all aspects and tasks necessary to design a functional product.
Conclusion:
Product management is to develop the product’s strategy and persuasively communicate that strategy. Then they ensure all decisions with regard to development, marketing, etc., reflect and support the strategy.