A Feature Flag is a software development technique that allows teams to enable or disable specific features in an application without deploying new code. This approach helps developers test new functionalities in real-time, gather user feedback, and gradually roll out changes to minimize risks. By using Feature Flags, companies can experiment with different features for different user groups, known as A/B testing. This method enhances flexibility and control over the software release process, making it easier to manage updates and improve user experience while maintaining system stability.