Quality assurance testers, often referred to as QA testers, are professionals responsible for evaluating software products to ensure they meet specified requirements and function correctly. They identify bugs and issues before the software is released to users, helping to improve the overall quality and user experience. These testers use various methods, including manual testing and automated testing tools, to assess the software's performance, usability, and security. Their work is crucial in the software development process, as it helps prevent costly errors and enhances customer satisfaction with the final product.