This plug-in opens links in blog posts and comments in new tab/window, therefore keeping your visitors on your blog. Without this plugin, when visitors click on external link, they are navigated away from your site, and may never come back to check other nice posts you have wrote. Note that ‘external’ in title is in parentheses, as it is just an assumption that links in comments will be external. If they point to pages within same blog, they are still opened in new tabs.
Opening Post & Comment (External) Links In New Window/Tab, Plugins, WordPress, WordPress Plugins