is_front_page()
/* is_front_page() returns true if the user is on the page or page of
posts that is set to the front page on Settings->Reading->Your homepage
displays. */
is_home()
/* is_home() return true when on the posts list page,
This is usually the page that shows the latest 10 posts. */
is_home()
// Determines whether the query is for the blog homepage.
is_home()