WordPress at a glance
function is not described

WP_Query::is_front_page() public WP 3.1.0

Is the query for the front page of the site?

This is for what is displayed at your site's main URL.

Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_on_front'.

If you set a static page for the front page of your site, this function will return true when viewing that page.

Otherwise the same as @see WP_Query::is_home()

It's a method of the class: WP_Query{}

No Hooks.

Return

true/false. Whether the query is for the front page of the site.

Usage

$WP_Query = new WP_Query();
$WP_Query->is_front_page();

Changelog

Since 3.1.0 Introduced.

Code of WP_Query::is_front_page() WP 5.5.1

<?php
public function is_front_page() {
	// Most likely case.
	if ( 'posts' === get_option( 'show_on_front' ) && $this->is_home() ) {
		return true;
	} elseif ( 'page' === get_option( 'show_on_front' ) && get_option( 'page_on_front' )
		&& $this->is_page( get_option( 'page_on_front' ) )
	) {
		return true;
	} else {
		return false;
	}
}