Green Screen is a technology through which the "Green Screen" background is replaced by a variety of scenes, and then, an image of a person(s), animal(s) is digitally inserted.  These are used to create effects and atmosphere to enhance the original image.  This is called overlaying an image.  The technology is similar to the way a weather map becomes the backdrop for a meteorologist on the weather channel.  Many unique effects can be applied using this technology.  Even if you choose to apply enhancements to your photos, they are still delivered in moments!

Below are a couple of examples of Green Screen technology. The images on the left were the original images taken with a green screen backdrop.  The images on the right, show the original image with the enhancement overlay added.