What business is Google really in? Of course, it’s in the search business; that’s why we go there. But it doesn’t profit from licensing its search. It is also in the service business, providing us with everything from email to document management to mapping to publishing tools to social networks to telephone directory assistance to video distribution. But it charges us for none of that. It is not in the stuff business, moving things or selling them (though it has not fully escaped the tyranny of matter; it buys a lot of atoms in the form of computers, and it has to spend a lot on charged atoms to power them). It is also not in the content business; apart from its collaborative, Wikipedia-like Knol, it doesn’t create or control original content but instead prefers to organise others’ (owning content would put Google in competition with the businesses whose content it exploits). Ultimately, Google is in the organisation and knowledge businesses. Google knows more about what we know and want to know and what we do with that than any other institution. But its profit doesn’t come from that either. Google’s profit comes from advertising, which it dominates because it is so good at search and has so many of us using its services and knows so much that it can target ads efficiently. Google knows what it is.