This is an application for making photoeffects, which possible superimpose both on photos, and on video.
The Photoeffect is a process of the electrons radiating by some material under the action of light (and, generally speaking, any electromagnetic radiation). We can read such in Wikipedia.
But you most likely under the "photoeffect" mind some special effects for your photos :)
If I've guessed, this page is created for you, and you have to like submitted here applications for making photoeffects.
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Related Link: Vector editor Inkscape