Newbie - Why it creates so much folders?

Hi friends,
 I started using tortoiseSVN just before 2-3 days and learning it how to
make use of it in my project. I made one account for project on
http://code.google.com/hosting/
 By clicking on 'Create a new project' I created new project in google. I
got SVN checkout URL from there, I used it using tortoiseSVN and got
connected to google SVN server (Repository) for my project.
 I tried connecting it many times to check how it exactly work. After few
attemps I came to know that many different different folders got created at
SVN Repository in google account.
 Here are folders n files which are exist in my Repository

README.txt,
branches/,
conf/,
dav/,
db/,
format,
hooks/,
locks/,
tags/,
trunk/

I wanna know whats the use of these folders? Or should I delete it?

Thanks,
Rohan Chandane

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