Pi Day is celebrated on March 14th (3/14) each year, honoring the mathematical constant π (pi), which represents the ratio of a circle's circumference to its diameter. This day is an opportunity for math enthusiasts to engage in activities related to geometry, circles, and the significance of pi in various mathematical concepts. Many people celebrate Pi Day by enjoying pie, participating in math-related games, and even hosting competitions to recite as many digits of pi as possible. Schools often use this day to promote interest in mathematics and to inspire students to explore the wonders of math in a fun and engaging way.