Clicked Image display it in Popup

I am looking for a free plugin that will let any of my images to popup when clicked. Because currently on my website, when I clicked the images on post it will open another page, where the image is solely displayed. Then I have to press back again to go back to my post. Is there are free plugin that will help me just open the individual images in popup style and the reader will just press the close button to go back to the post?

Thank you.