Related posts widget is very useful and it attracts more traffic. It displays post heading with thumb nail of all the post from same Label, Category or Tag. The relevant post particulars are automatically picked up and displayed under the post. You can define the number of the related posts displayed under each page. For example if you have 15 posts under a label, tag or category and you want to display 5 related posts, in such case latest 5 latest posts will be picked automatically and if you have only 3 posts under a label, tag or category all of them will be displayed.