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 \[ f(x)= a \: \sin{(b x+c)}+d \] 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.