This method is similar to polynomial interpolation with the difference that the control points are outside of the object's path. In other words, the object does not pass through the control points as it moves. In general, this method is common in computer graphics because the knots allow for much smoother path-generation than the polynomial equivalent at the same time that fewer knots are required. B-splines also respond better to Runge's phenomenon:

In the following Time for action section, we will see in the three different interpolation techniques that have been introduced in practice: linear, polynomial, and b-spline.