I happened upon an article in one of the papers this week that touched a subject I had never heard about, here is some of it:
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The internet is like an iceberg. The web as we know it – every Google result, all the billions of pages we visit – is just a tiny fraction jutting above the waves. The vast majority of it is invisible to web browsers and the general public. This is known as the ‘dark web’.
Most of this unseen mass of activity is perfectly innocent – paid-for content, sites that require log-ins, academic data, and so on.