National Sour Candy Day is observed worldwide every July 18, celebrating the diverse varieties of sour candies. This holiday was established in 2015 by the American Licorice Company, known for its Sour Punch brand, to encourage people to try sour candies. The origins of sour candy date back to the 19th century, when manufacturers began using acidic ingredients to create a sweet and sour flavor. The modern sour candy movement gained momentum in the mid-20th century, particularly with the introduction of iconic brands like Sour Patch Kids and Warheads. Celebrations often include sharing packs of sour candy with friends, visiting sweet shops for different flavors, and hosting candy-themed parties. Participants frequently promote the holiday on social media using hashtags like #NationalSourCandyDay and #SourCandyDay.