Where does my Springboot application load its database from?

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It depends on the configuration of your Springboot application. By default, if you are using the H2 database, it will load the data from an in-memory database. You can also configure your application to load the data from a local or remote database such as MySQL, PostgreSQL, MongoDB, or Cassandra. This is typically done by setting the appropriate configuration properties in the application.properties or application.yml file. The specific configuration required will depend on the database you are using.