What is the difference of 5 video sizes?

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I know there are 5 video size options when publishing the presentation in video format. I just wonder the difference of them.

Focusky allows users to publish the awesome presentation in video (*.mp4). What's more, there are 5 video size options available. Different video size means different quality and definition. Anyway, 1080P HD is with the highest quality,definition and larger size.

Then here we will list 5 videos with different video size for your reference.

1Video Size: 360P