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there are so many factors from your workflow that could be the cause. From importing or placing images, managing the links, export profile settings and so on.
this question is a lot more to do with graphic design 101 than a particular problem or distinct piece of advice. (hence no-one responding here)
goto lynda.com, and check out the many tutorials. I'm sure that is the best thing for you... you really need to grasp the basics on InDesign, or even advice you get here may be confusing.
What you haven't provided us is what settings you used for exporting PDF form InDesign. If you used the PDF (interactive) export option with default settings, your imagery is being downsampled tremendously to 72dpi. If you used the PDF (print) export option with either the PDF/X-4:2008 or High Quality Print joboptions which downsample images to 300dpi only if they exceed 450dpi, it is very unlikley you are going to see any degradation.
Tell us more about exactly how you are creating PDF and we can better assist you.
Thans for the response, the problem actually was that I exported the PDF as interactive as Dov mentioned.
So I Exported the InDesign now to PDF Print, and everything is perfect now.
I even printed it now, and its perfect. Thanks for the answers!