Feature flags in Spring Boot provide a method for efficient feature management, allowing developers to control the release and testing of new functionalities without redeploying code. This technique is beneficial for A/B testing and canary releases, enabling selective feature exposure to specific user groups to gauge reactions or mitigate risks. The implementation of feature toggles, as demonstrated with Split by Harness in a Spring Boot web API, involves setting up an environment to manage these toggles, configuring the necessary software dependencies, and updating application code to integrate the toggles. This process enhances a software release life cycle by supporting continuous integration and deployment, thereby enabling swift and consistent production changes. The practical application was illustrated through a tutorial on adding a feature toggle to manage reservations in a sample restaurant API, showcasing the real-world utility of feature flags in software development.