Feature Flags

Summary

A technical mechanism to turn a feature on or off (or for specific user segments) without a new deployment — the infrastructure that makes staged rollouts and A/B tests possible.

• 1Learn the basic concept of a feature flag and how it differs from a config file.
• 2Understand why flags let you roll back instantly without an emergency deploy.
• 3Explore a feature-flagging tool's docs (LaunchDarkly, Split, or similar) at a high level.