What is pie in maths?

Pi, represented by the Greek letter "π" (pronounced "pie"), is a mathematical constant that represents the ratio of the circumference of a circle to its diameter. The value of pi is approximately 3.14159 but is an irrational number, meaning that it cannot be expressed as a simple fraction. Pi has been calculated to trillions of decimal places, and its digits appear to be randomly distributed with no discernible pattern.