Explainer-What does ruling on Google's illegal ad tech monopoly mean?

SAN FRANCISCO :A U.S. judge's ruling that Google has illegal monopolies in ad technology sets up the possibility of U.S. prosecutors seeking a breakup. Here's what the case involves and what Google owner Alphabet faces from here.WHAT IS THIS ABOUT?The most important thing is what this is not about: this is not about search, Google's bread and butter, although there is a separate antitrust case about search. The Justice Department's ad technology case revolves around Google Network, a division of the business that manages its auction-style system that advertisers use to purchase digital ad space. The ad tech chooses what ad to put where at what cost. Federal prosecutors said that Google's power over the ad tech allows it to illegally fend off competition, which hurts web publishers, such as news outlets. The judge agreed. Google's argument was that it out-competed rivals with superior technology.Advertising accounted for about 75 per cent of Alphabet's $350.02 billion in revenue for 202...