W+K is an independent global creative agency known for creating iconic, culture-shaping advertising, most famously for Nike's "Just Do It" campaign, but also for brands like Old Spice, McDonald's, and Ford, focusing on "cultural production" rather than just ads, using creativity, media, and strategy to build strong brand connections. Founded in 1982 by Dan Wieden and David Kennedy, it's celebrated for its distinctive, often irreverent approach, challenging norms and integrating brands deeply into culture.