Abstract: Everyone has some idea about pi. It is 22/7 (approximately) when calculating areas and perimeters. While measuring angles it is in radians what 180 is in degrees. It is an irrational number, etc. Less appreciated is the fact that it is connected with many diverse subjects ranging from probability to number theory, and its study has a very rich history. In this talk we will discuss some interesting facts about this object. Most of the talk will be accessible to anyone with an interest in mathematics.