A dynamic value stored outside the application code that configures behavior across different environments (development, staging, production).
Environment variables store configuration like database URLs, API keys, feature flags, and debug settings. They follow the 12-factor app methodology by keeping config separate from code. Tools like Doppler, .env files, and system environment inject them at runtime.
Setting DATABASE_URL, DJANGO_SECRET_KEY, and OPENAI_API_KEY as environment variables managed by Doppler, injected at runtime.
Environment variables let the same codebase run in development, staging, and production with different configurations, with no code changes needed for deployment.
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