QA (Quality Assurance) teams play a crucial role in startups by ensuring that the product or service meets the desired quality standards before it reaches the market. Their responsibility extends to identifying bugs, ensuring usability, and guaranteeing that the product complies with relevant regulations. In the context of a startup, where resources are limited and time-to-market is critical, the QA team ensures that the product is reliable and performs well, thereby enhancing customer satisfaction and reducing churn rate.