The role of a product manager in tech startups is vital for driving the development and success of a product. They are responsible for defining the product vision, gathering and prioritizing customer requirements, and ensuring alignment across teams such as development, marketing, and sales. Product managers conduct market research to identify opportunities and use data analysis to inform decision-making. Their role also includes creating a roadmap for product development, monitoring progress, and communicating effectively with stakeholders to ensure that the product meets user needs and business goals.