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Spring Boot allows the developers to run the same application in different environments by making use of its feature of external configuration. This uses environment variables, properties files, command-line arguments, YAML files, and system properties to mention the required configuration properties for its corresponding environments. Following are the sources of external configuration:

Command-line properties – Spring Boot provides support for command-line arguments and converts these arguments to properties and then adds them to the set of environment properties.

Application Properties – By default, Spring Boot searches for the application properties file or its YAML file in the current directory of the application, classpath root or config directory to load the properties.

Profile-specific properties – Properties are loaded from the application-{profile}.properties file or its YAML file. This file resides in the same location as that of the non-specific property files and the {profile} placeholder refers to an active profile or an environment.

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