Would you explain How to determine the equation of the function and what does it mean to determine the sign of the function in each interval "created by zeros"of the function?

With these given points:

(-12,-30888), (-10,-12375), (-8,-4032), (-6,-945), (-4,-120), (-2,-3), (0,0), (2,3), (4,120), (6,945), (8,4032), (10,12375), (12,30888)

Thanks