What does a speaker voice coil do?

Push and pull the cone rapidly, the moving cone moves the air which we hear as sound.

all of that is true but i would like to add some thing. the electricity that go's in to the speaker go's in and through the coil and turns it in to a electo magnet ang move acording to the way the electricity is moving because there is another perminent maget around it

so the cone moves and air moves and vibrates our ear drums so we hear sound

hope this helps