What do they think people are searching for where the ads are valuable? I've never clicked an ad and it be what I wanted, except when it's like a search for "ta

What do they think people are searching for where the ads are valuable? I've never clicked an ad and it be what I wanted, except when it's like a search for "target" and I wanted "target.com" and Target paid for the top ad spot (which would have been the first link if there were no ads)