Final answer:
A Product Manager is responsible for crafting and executing marketing plans for products aimed at specific customer groups, understanding customer needs, and coordinating with other departments to ensure product success.
Step-by-step explanation:
The individual who is responsible for developing and implementing the marketing plans for products sold to a particular customer group is commonly known as a Product Manager. This role involves a deep understanding of the product's market, the needs and behaviors of the customer group, and the creation of strategies to meet those needs effectively. A Product Manager coordinates with various departments such as development, sales, and marketing to ensure that the product is tailored to the customer's needs and preferences and is well-represented in the market.