Dealing with Data files - Introduction needed

Hello. If you have seen my posts before, I am a beginner programmer in college. We are dealing with data files and the week that we started, I had to have surgery and now I am far behind. If you know enough about data files to try to explain how they work, please PM me. I would really appreciate any knowledge about these files you may have. Thank you.
No point in PMing you, point of a forum is that we discuss things. Anyway, here's the comprehensive STL file IO introduction: http://www.cplusplus.com/doc/tutorial/files/
(Anybody else wonder why our tutorial doesn't have a containers section?)
I always thought of this as the containers section:
http://www.cplusplus.com/reference/stl/

It's not really a tutorial but...
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