Feature Flag

A feature flag is an on-or-off switch for a piece of code that you can control after deployment. With flags, you can release a feature to a small audience, turn it off instantly if there is a problem, or target it to certain users. Flags make it easier to test safely in production and to separate release from launch. They also let product and engineering coordinate rollouts without new builds.

Example: You can use feature flags to enable a new recommendations widget for 10% of traffic, then raise it to 100% once it proves stable.

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