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1) KDE is desktop environment, an alternative to Gnome and XFCE and other desktop environments out there. Just use google to see some screenshots.
2) Because Okular probably depends on libraries that are provided by KDE only. As an alternative, you can install a PDF viewer that does not require KDE (e.g. evince).
3) No. It only means you'll now have two desktop environments to choose from at the log-in screen. Your Gnome applications should be added to your KDE start menu just as your KDE applications should be accessible from your Gnome start menu.
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