Your comment on your user page was:
I am puzzled at how wikipedia is moderated! Will someone please explain this to me?

I'm happy to answer your questions, but I'm not exactly what your question is - what do you mean by "moderated", precisely? All of the content you see on Wikipedia is contributed by users like yourself, making it a sort of very large scale collaboration project. So if your use of the word "moderation" refers to the removal of vandalism, the answer is fairly simple: it too is all done by users, who keep a close eye on the recent changes around Wikipedia. There are some more complicated methods and tools that are employed to monitor these changes, but that's the simple answer. Is that what you were looking for? Feel free to respond here (on your talk page) by leaving your own message directly beneath mine. Cheers. e(spit)