Wp-config.php is a core WordPress file. Information pertaining to the database is contained in this file, such as its name, username, password, and host (typically local host).
WordPress uses this information to store and retrieve data ( such as users, posts, settings, etc.) from the database. WordPress does not include the file wp-config.php in its default download package. It contains a file named wp-config-sample.php, that can be renamed to wp-config.php.
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