By constantly downloading random information from the internet, wouldn’t you be exposing yourself to tons of malicious content? Aren’t there pages that can run malware without you even clicking on anything?
A better example than search engines might be something like “the wayback machine”, a site that actually saves the pages, and not just links.
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Think of it like the difference between photocopying a book and reading one. Your Web browser reads the page code and interprets it. Crawlers and things like the way back machine just copy the page code or specific bits in the code.
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