National Graham Cracker Day is observed in the United States every year on July 5. This holiday celebrates the graham cracker, a sweet cracker invented in the mid-19th century and named after Sylvester Graham, who promoted a healthy vegetarian diet. Originally, graham crackers were homemade using graham flour, lard, molasses, and salt, and they gained popularity with the mass production by the National Biscuit Company in 1898. The day is often marked by indulging in treats like s’mores, which consist of toasted marshmallows and chocolate sandwiched between two graham crackers. Additionally, graham crackers are used in various desserts, including cheesecake crusts and sweet sandwiches. While the origins of National Graham Cracker Day are unclear, it provides a fun opportunity for people to enjoy this versatile snack and share their celebrations on social media with the hashtag #NationalGrahamCrackersDay.