Video is basically data; rather we can term it more aptly as a signal. The signal can be transmitted as analog or digital signal/data; but the thing which remains in the background is that what makes this signal so special.
Let us look at this that "how video is displayed on a screen".
First we need to know the basics that a video is basically “moving pictures”. So how come they are different from the images. Consider the case of flipbook. Let me help: This is a flip book – a book in which we draw the images in succession and when we flip the pages then we see the people/animals present in images in motion. This is “pictures in motion”.
So we can say that video is made of images running in succession. These are technically called frames. A human eye can differentiate between individual images if images switch at rate of 10-12 images per second. If the rate increases from this value, then we get an illusion that the object in images is moving. The reason is that our mind display centre (visual cortex) doesn’t get enough time to retain the images and process them individually.
These are the frames of video (roger federer) . If we look now then we can clearly say that these are different distinguishable images, but when they run in succession at speed of 24-30 fps (frames per second) we are not able to distinguish them and we term it as “video”.