Duff Beer is the famous fictional beer brand from The Simpsons, widely recognized as Homer’s go-to brew and a central gag of the show. In the universe of Springfield, Duff Beer is represented as the flagship product promoted by the mascot Duffman, with jokes about its mass-market, low-cost appeal and parodying real-world beer brands. Over the years, multiple real- world brewers have produced their own versions inspired by Duff, sometimes licensing or commercially distancing themselves to avoid legal issues, while others created bootleg or tribute versions. The official in-universe brand remains fictional, while real-world imitators have existed in various countries under different names and licensing arrangements.