A product vision is a statement that defines the purpose and direction of a product, highlighting its unique value proposition and how it solves customer problems. It acts as a guide for strategic decisions related to the product roadmap and helps align teams towards a common goal. To write an effective product vision statement, involve your team in co-creation, stay realistic, keep it clear and concise, and make it a North Star goal. Aligning your product vision with your product roadmap is crucial for seamless execution of the product strategy and driving growth.