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The interpolation is basically a way to "guess" the values between two set/known values. Linear interpolation just simply applies a linear transition between two values. While cubic interpolation looks a bit more into other points and tries to get a more smooth transition. Especially on "sharp edges" it gets nicer smoother curves - but, as said at a cost.

Here are some links (if you like):

### Linear and Cubic Spline Interpolation

In this post on numerical methods I will share with you the theoretical background and the implementation of the two types of interpolations: linear and natural cubic spline. These interpolations a…

codefying.com

Or a nice video might also give you a grip on what I was talking about