Periodic Function
The function shown is $ f(t) = \sin(t) $.
Note the repetition of the function every 2\pi along the x-axis.
The function $ f(t) = \sin(t) $ from 0 to 15.
Non-Periodic Function
The function shown is $ f(t) = {\sin(t)\over t} $.
Note that the function never repeats itself. It changes constantly over its entire expanse.
The function $ f(t) = {\sin(t)\overt} $ from 0 to 15.
