As someone who works in television, here is my answer:
When editing a television show, you often add effects to the original footage. Maybe you have changed the way the picture looks by correcting the colours. You may also add an effect that zooms into the picture as it plays. For good measure lets say you also slow it down.
Each of these effects, and the many others that exist, equals more processing power and the computer starts to struggle eventually. Most often, we experience this as a playback issue – instead of playing smoothly as you would see on your TV, it stutters as the computer struggles to keep up.
So we render it. In this instance, the word render refers to the creation of brand new media, including all the effects you have added, in order that the machine no longer needs to process all the effects – it just reads the newly created media.
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