National Snack Day is observed in the United States every March 4. This unofficial food holiday celebrates snacks, which are small portions of food eaten between regular meals to alleviate hunger. The term "snack" originates from the Middle Dutch word "snacken," meaning "eager to bite," with its first recorded use in the early 15th century. Historically, peanuts were the first popular snack food in the U.S., introduced from South America and gaining popularity in northern states post-Civil War. While many associate snacks with high-calorie, low-nutrient packaged foods, the definition encompasses a variety of options, including fruits, vegetables, and healthy alternatives. Celebrations may include trying various snacks throughout the day or hosting a snack party where friends bring their favorite treats to share and taste.