Feature Flag

A technique that allows a specific feature of piece of code to be toggled on or off from outside of the code itself

Benefits

• Allows for toggling features outside code base
• There's no need to release a new version of the app or roll it back to toggle a change
• Developer time isn't required to toggle the app's features

Used for

• Product Testing such as soft launch with incremental rollout
• Conducting experiments like A/B testing
• Migrations
• Canary Launches with incremental rollout
• System Outage
• Continuous Deployment