European competition authorities slapped a €2.42bn (£2.1bn) antitrust fine on Google for abusing its search engine dominance by giving "illegal advantage" to its own online shopping service.
The European Commission's seven-year investigation concluded on Tuesday that the US company had abused its near-monopoly among online search engines.
Google was found by the Commission to have given the dominant placings on search results to its own services and left rival services further down the page.
Abuse of market dominance
Margrethe Vestager, the Commission's head of competition said: "Google abused its market dominance as a search engine by promoting its own comparison shopping service in its search results and demoting those of competitors."
She added: "What Google has done is illegal under EU antitrust laws."
The €2.42bn penalty was the largest antitrust fine the Commission has ever issued, more than doubling the previous biggest of €1.1bn issued to Intel in 2009 for abusing its dominance of the microchip market.
The Commission gave Google 90 days to stop breaking European Union rules, else face further fines.
Vestager continued: "It denied European consumers a genuine choice of services and the full benefits of innovation."