What fictional advertising world did McDonald's introduce in 1963?

McDonaldland was the fictional advertising world McDonald's introduced in 1963.

The setting presented McDonald's as a fantasy landscape populated by recurring characters, including Ronald McDonald, Mayor McCheese, Grimace, the Hamburglar, and Birdie. These figures appeared in television commercials, restaurant displays, packaging, and promotional materials.

McDonaldland helped turn the restaurant brand into a story world aimed especially at children. Its characters were not all introduced at the same time, and some were later retired or redesigned. The name is sometimes confused with the name of the restaurant chain itself, but McDonaldland specifically refers to the fictional setting used in advertising.