Form shortcode for JetFormBuilder

jet-form-builder-shortcode.php

<?php

add_shortcode( 'my_jet_form', 'my_jet_form_shortcode' );

function my_jet_form_shortcode( $atts = array() ) {

	$atts = shortcode_atts( array(
		'id'            => false,
		'submit_type'   => 'reload', // or ajax
		'required_mark' => '*',
		'fields_layout' => 'column', // or row
	), $atts );

	$id = ! empty( $atts['id'] ) ? absint( $atts['id'] ) : false;

	if ( ! $id ) {
		return;
	}

	unset( $atts['id'] );

	$builder  = new \Jet_Form_Builder\Blocks\Render\Form_Builder( $id, false, $atts );
	$messages = jet_form_builder()->form_handler->get_message_builder( $id );

	ob_start();

	$builder->render_form();
	$messages->render_messages();

	return ob_get_clean();

}

What does this do?