Intro Your biggest client just requested early access to a new dashboard you've been building. The feature is ready but it's sitting in the same codebase that every other user hits. You don't want to create a separate branch, maintain two deployments, or worse, accidentally expose a half-finished UI to users who weren't supposed to see it. So what do you do? This is exactly the kind of problem feature flags were built for. Instead of branching your infrastructure or gating access with a tangle of if (user.id === 'acme-corp') checks scattered across your components, you wrap the feature in a flag. Acme Corp gets it. Everyone else sees nothing different. When you're ready to roll it out wider, you change a config without any redeploy or drama. Feature flags (also called feature toggles) let you separate deployment from release. You merge and deploy code freely, but control who sees what from a dashboard. The feature lives in production but stays invisible until you say otherwise.…