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geometry teacher
They use it to describe the relation of the circumference to the diameter
While it is suggested that the concept of pi has been in use since the time of the Egyptians, the firs person to extensively calculate pi (and whose name is most synonymous with it) is Archimedes
Pi is an irrational number; it can't be represented as a fraction of two integers. It has been proved that the majority of real numbers are irrational. The proof that pi is irrational was found in 1770; it's slightly too complicated to put in this answer, but if you search with google for pi irrational proof then you will find several different proofs.