What and How to Configure Spring Profiles?
Briefly

Spring Profiles allow separation of configuration for different environments, enabling seamless management of application settings through distinct configurations for development, testing, and production.
In real-world applications, varying environments demand different configurations. Spring Profiles streamline this by ensuring the application adheres to the expectations of each environment seamlessly.
By default, Spring Boot falls back to the 'default' profile if no other profile is specified, simplifying local development without requiring persistent profile activation.
You can create profile-specific configuration files like application-dev.properties and application-prod.properties. Spring Boot automatically selects the relevant file based on the currently active profile.
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