What exactly do Aperture previews do?

Sorry, I'm sure this has been asked a lot but I can't find a topic that outright explains it. Seems most everyone knows what it is but I'm just lost on it. So what exactly is the point of creating previews? It sounds like they're used to display images on other devices such as Apple TV, iPad, etc. I have a 1440p monitor, so why does it recommend 2560x2560? Why does my monitor need to access a preview instead of just accessing the photo itself? And which setting should I use? I access photos on my iPad Mini Retina, Apple TV on a 60'' 1080p HDTV, and my 1440p  27'' external monitor. I don't need max detail on the iPad or Apple TV but I don't want them to look like ****, either. If previews directly affect my external monitor, I guess I'll have to go with the highest setting but I don't want to do that because it'll take up so much room on my iPad, I would assume.

Preview are used for two purposes:
Sharing with iTunes for syncing to your devices, and sharing with the Media browser, to be used in other applications, like Keynote, Pages, Mail, ... .
For browsing your Aperture library, if your original image files are offline - if you are using a referenced library, with the original image files on another external drive.
Pick the highest preview resolution, that wll be necessary for either of this purposes - to the size of the largest monitor you are actually using.
Why does my monitor need to access a preview instead of just accessing the photo itself? And which setting should I use? I access photos on my iPad Mini Retina, Apple TV on a 60'' 1080p HDTV, and my 1440p  27'' external monitor.
In Aperture itself you do not need the previews. Aperture will render the displayed image from the original image file and apply all adjustments. But other applicationsneed a preview with the adjustments applied, since they cannot reproduce the image processing.
-- Léonie

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