McDonald's introduced “I'm Lovin' It” in 2003 as a global branding campaign.
The campaign marked a major effort to give McDonald's a common worldwide identity while allowing local advertising and menu choices to vary. Its short, conversational wording was designed to sound natural in music, television commercials, packaging, and restaurant promotions.
The campaign is often associated with the “ba da ba ba ba” musical phrase, which became a prominent part of its audio branding. McDonald's retained the slogan for many years, making it one of the company's most durable modern brand lines.
The phrase should not be confused with earlier slogans such as “You Deserve a Break Today” or “We Love to See You Smile.” Those campaigns belong to earlier eras. “I'm Lovin' It” is specifically the 2003 global campaign and remains closely linked with McDonald's contemporary identity.