An html5 applet to explore the properties of the graphs of sine functions. The parameters $a$, $b$, $c$ and $d$ included in the definition of a sine function of the form

may be changed and therefore the graph of function $f$ explored. There is a radio button to graph $\sin(x)$ in order to compare the graphs of $f(x)= a \: sin{(b x+c)}+d$ and $\sin(x)$ and therefore better understand the graph of general sine functions.