National String Cheese Day is observed worldwide on September 20 each year to celebrate the nutritious and popular snack known as string cheese. This holiday was founded in 2017 by Galbani, an Italian cheese brand, to honor the love Americans have for this cheese variety. String cheese, typically made from low-moisture mozzarella or a blend of mozzarella and cheddar, is characterized by its semi-soft, fibrous structure that allows it to be pulled apart in strips. The American version was invented by Frank Baker in 1976, who sought to create consumer-sized units of mozzarella cheese. Common customs for the day include snacking on string cheese, experimenting with recipes that incorporate it, and sharing experiences on social media with hashtags like #NationalStringCheeseDay.