A product manager plays a critical role in tech companies by acting as a bridge between different teams, such as engineering, design, marketing, and sales. Their primary responsibility is to define the product vision and roadmap, ensuring alignment with market needs and company goals. Product managers gather and analyze user feedback, prioritize features, and oversee the development process from inception to launch. They must balance stakeholder interests while keeping the end-user in mind, making decisions that drive both the product's success and overall customer satisfaction.