The Department of Justice presented its opening arguments in a case against Google's advertising technology, accusing the company of antitrust violations. The DOJ claims that Google's service, which connects websites to advertisers and places ads on third-party websites, operates in a narrowly defined advertising market.

The DOJ plans to call witnesses from larger ad brokerage services such as Comcast, Trade Desk, and Pubmatic, as well as print advertisers like newspapers.

Google's lead attorney countered these accusations by emphasizing the company's vigorous competition with other firms like Microsoft and Disney. The attorney also highlighted Google's investment in research and development to enhance its ad technology.

The Computer & Communications Industry Association (CCIA), which has advocated for competition in the tech industry for over 50 years, has aligned with the DOJ in previous cases involving IBM, AT&T, and Microsoft.

CCIA President Matt Schruers commented on the case: "Even as the trial begins, the premise of the DOJ case remains puzzling. Digital companies compete vigorously for advertising dollars across various mediums and screens of all sizes, yet the government artificially draws a line around one approach to ad tech. This is an implausible view of a highly dynamic digital marketplace – to say nothing of print, outdoor, and broadcast."