Exponential Growth vs. Linear Growth
"Linear functions grow by equal differences over equal intervals.
Exponential functions grow by equal factors over equal intervals."
Source: http://www.corestandards.org/Math/Content/HSF/LE/
Check it out!
Note the growth of the exponential function when its base is 2 and compare this growth to the exponential function with base of 3. (When you make the base = 3, you may want to zoom out before sliding the slider.)