Sine wave- a wave with a single pitch or frequency, like a tuning fork. It sounds smooth and pure.
Square wave- a wave with sharp changes in voltage levels. Sounds harsh and buzzy.
sawtooth wave- a wave that rises smoothly and then drops dramatically. Sounds bright, harsh, and buzzy.
triangle wave- an odd number of sine waves, which resembles a triangle. Sounds somewhat clearer and brighter.
