About Github Issues
Use issues to track ideas, enhancements, tasks, or bugs for work on GitHub. Many projects collect user feedback via a central bug tracker. GitHub's tracker is called "Issues," and can be used with every repository.
Github Issues - Details & Top Features
Github issues is a simple tracker attached to your code repository to help you maintain feature requests, enhancements & bugs effortlessly. Its primary value-add is the close integration with your code repository allowing you to mark issues even with individual pull request, with just one click.