Unless you have been hiding in a cave somewhere, you are probably familiar with Photoshop to at least some extent. Even if you have not used it, you will have seen photos that have been manipulated using this program, which has become a feature of many websites in recent years. The basic idea of Photoshop is that it can be used to enhance or add to a real photo.
For example, if a picture has been taken which, on closer inspection, carries traces of something that the viewer “should not see” - for example, blotches on the face of someone in the photo, or a stain on the carpet – the use of Photoshop can remove that undesired intruder. Similarly, Photoshop can be used to add things such as color or light.
A more esoteric use of Photoshop can be seen on countless sites around the Internet where photographs are deliberately and obviously manipulated for (usually) comedic effect. Whether it is putting someone else's head on the body of an animal (or another person), placing a person against a background with comic potential or creating the impression that someone is a hundred feet tall, this is a popular pastime.
You may love or hate Photoshop. Some people will use it to enhance their own photographs before putting them on social networking sites, and create the impression that they are more attractive than they really are. This may not have been the initial purpose of the program, but people will use it how they wish.