The antitrust trial against Google is the most significant in decades. The government’s case centers on its exclusive deals with smartphone makes and carriers to make it the default search engine. Google’s CEO defended these partnerships, especially with Apple, as integral to their success. Despite options, Google dominates Internet searches and digital advertising, which accounts for 80% of Google’s revenue. The outcome of the trial could force profound changes in search engine choice, advertising, and potentially lead to Google’s breakup.