If you’re new to WordPress blogging, you may have noticed the “featured image” dialog box on the right side of your “Add New Post” page. The featured image is a way to tell WordPress and social media that the image is special and should be used as the default image for all links that call for an image.
Without the featured image identified, you’re forcing the internet to select an image from your website. That can be frustrating to you because the image automatically selected probably won’t have anything in common with your post. Setting a featured image will ensure your post contains the correct image when linked to Facebook, Twitter, Google+ and other social platforms.
Selecting a featured image doesn’t automatically place that image into your post. It simply tells anyone linking to your post that, if they want an image, that’s the one to use. If you want the featured image to appear in your blog post, you’ll still have to insert it into your post using the “add media” button on top of your WYSIWYG editor, in the black admin bar along the top of your site (visible when logged in) or on the dashboard between “Posts” and “Pages.”