What is the significance of line 14 in the PHP script provided?

The significance of line 14 in the PHP script is that it is closing the database connection using the `mysqli_close()` function. This is important to ensure that resources are properly released and connections are closed after the database operations are completed. Failure to close the database connection can lead to memory leaks and potential security vulnerabilities.

// Closing the database connection
mysqli_close($connection);