Spline interpolation

Spline interpolation is a way to fit a curved line between several points. Imagine a road with many corners - it's easier to draw and drive on the road if there's a smooth curve between all the corners, instead of a straight line going from corner to corner. In the same way, spline interpolation can be used to draw smooth lines between points on a graph. The computer finds the best-fitting curve that passes through all the points we give it.