In this example, the user ID is obtained from a URL parameter and used to delete the corresponding user record in the database. If the delete query is successful, a success message is echoed to the user. Otherwise, an error message is displayed. Package/Library: The database connection and query execution in this example suggest the use of a PHP database library, such as the mysqli or PDO libraries. These libraries provide methods and classes for connecting to databases, executing queries, and managing user data.