Only show div on homepage/blog index in wordpress/php

The following example can be used in your sidebar to display different content when displaying home page. 

<?phpif ( is_home() ) {
    // This is a homepage} else {
    // This is not a homepage}?>

 ------------------------
Also here is an other code.

<?php if(is_home()): ?>

<div>Your div.</div>

<?php endif; ?>

Using above code works fine as long as you are not setting static Page for the Front Page display from here Administration > Settings > Reading.

<?php if(is_front_page()): ?>

<div>Your div.</div>

<?php endif; ?>

But this code will work irrespective of whether the main blog page is showing or you have set a static page to show on home page.