Judge Brinkema’s ruling found Google “liable under Sections 1 and 2 of the Sherman Act” for its monopolistic behaviors in the ad tech tool and exchange businesses, but the judge did dismiss another charge that Google had operated a monopoly in ad networks.

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.

The ruling is the latest against Google in the last year finding the company acted illegally to maintain market dominance.