" . mysqli_error($conn); } // Close database connection mysqli_close($conn);This code uses the mysqli_connect() function to establish a connection with a MySQL database. It then sets variables for the user's profile data and inserts the data into the database using an SQL query. Finally, it checks for any errors and closes the database connection. The package library for this functionality would likely be a PHP library for MySQL database management, such as MySQLi or PDO. These libraries provide functions for connecting to a database, executing queries, and managing data in the database.