What slogan did McDonald's launch in 2003 as part of a worldwide marketing campaign?

McDonald's launched the slogan “I'm Lovin' It” in 2003 as part of a worldwide marketing campaign.

The campaign was introduced internationally and became one of the longest-running slogans in McDonald's advertising history. Its informal wording was designed to sound conversational and to connect the restaurant with enjoyment rather than simply describing a product.

The campaign is also known for its “ba da ba ba ba” audio signature. The jingle became a major part of McDonald's sonic branding and often appeared alongside the slogan in television, radio, digital, and in-store advertising.

The slogan is sometimes confused with earlier McDonald's lines such as “You Deserve a Break Today.” Those campaigns belong to different periods; “I'm Lovin' It” dates from the company's global rebranding effort in 2003.