The number "3.14" is a common approximation of the mathematical constant π (pi). This constant represents the ratio of a circle's circumference to its diameter. In simpler terms, if you measure the distance around a circle and divide it by the distance across it, you will always get a number close to π, which is approximately 3.14. π is an important number in mathematics and appears in various formulas, especially in geometry. It helps us calculate the area and circumference of circles. Because π is an irrational number, it has an infinite number of decimal places, but 3.14 is often used for quick calculations.