World Kombucha Day is observed worldwide every February 21, celebrating the fermented drink known as kombucha, which is made using a symbiotic culture of bacteria and yeast added to sugared tea. This drink is believed to have originated in ancient China, where it was thought to have healing properties, and it gained popularity in the United States starting in the mid-20th century. The day was launched in 2020 by Kombucha Brewers International to promote kombucha globally and to encourage occasional consumers to become enthusiasts. Celebrations often include free tastings, promotional deals, and industry events for brewers. The holiday is recognized on social media with hashtags like #worldkombuchaday. Notably, traditional kombucha accounts for only a third of the market, with flavored varieties being more popular among consumers.