Product Managers are the cornerstone of product success, responsible for the strategy, roadmap, and feature definition of a product or product line. They act as the bridge between various business functions, coordinating between technical teams, marketing, sales, and customer support to ensure a cohesive product strategy. Product Managers define the why, when, and what of the product that the engineering team builds, directing the business strategy for products, prioritizing features, and focusing on the overall product goals.