http://en.wikipedia.org/wiki/E_(mathematical_constant)
To start with e is just a number. It has some very special properties.
I have included a web link if you want to know more.
e is approximately equal to 2.71828
It is a special number in a similar way to pi being a special number.
Pi and e are both irrational numbers
If you want to get an approximation of e on your calculator
put it in as e= or if that doesn't work try e^1=
(You may need to press the shift button first to get e)
+118654 
