Featured images, commonly known as post thumbnails, are an essential part of many WordPress themes.
Adding or removing featured images for a single post can be done by editing a post..
HOWEVER changing or editing them for multiple posts can be a cumbersome and wasting so much of your time!
Then introducing WP ImageGenie!
WP ImageGenie lets you to setup Featured Images to your posts much more efficiently, especially if you have lots of posts to go through.