Why are there many currencies (money types) ? $ € CAD NIS PLEASE STAR THIS?

same reason as there are different types and sizes of cars. Different people have different transportation needs - young people like you need something fast and pretty, family people need room for 3 kids and a stroller, old people need safety and ease. Same with currencies - different countries have different inflation rates, different need for monetary policy. In Europe, common currency has forces successful German economy to bail out the over-spending Greek government.