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Ratul,
The Atomos Ninja is an external monitor and recorder mainly used by professional videographers to record in Pro Res RAW. I mainly use it to create the courses and record the screen of the camera.
I also use it to record videos at the same time as clicking images. So the camera clicks the images and at the same time Ninja records the video separately. That way I have the still images in the camera and the same action in video from Ninja V+ which I use. The files it creates is really huge and honestly unless you are a professional videographer, it does not make sense to buy it.