The function of a bug tracker in software development is to identify, record, and manage defects or issues in applications. It enables developers and project teams to document bugs, prioritize tasks, and track progress toward resolutions. Bug trackers streamline communication among team members, ensuring accountability and transparency throughout the development process. They often include features for assigning tasks, setting deadlines, and monitoring changes. By facilitating efficient bug management, these tools enhance software quality and contribute to timely project delivery, ultimately improving user satisfaction with the final product.