Question

1. what do we call the process of estimating future data?
2. what do we call the estimation of data between existing data points?

Explanation:

1. The process of estimating future data points that extend beyond the existing dataset is defined as extrapolation.
2. The process of estimating values that lie between already known, existing data points is defined as interpolation.

Answer:

1. Extrapolation
2. Interpolation