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Ok, you know that a web site is placed on a web server? This web server tracks and saves all the the requests for files that arrives. I.e. every time a page or an image is seen in your browser it is one request. Also if a search engine spider accesses your site. All these requests are saved into a file called weblog.
Not certain a 3-year old would understand that, I certainly would not have at that age, but the youth of today is more knowledgable :)