You have reached the end of Lesson 6! Double-check the to-do list on the Lesson 6 Overview page [1] to make sure you have completed all of the activities listed there before you begin Lesson 7.
Interpolation methods are used for creating continuous surfaces for many different phenomena. A common one that you will be familiar with is temperature.
Have a quick search using Google Scholar to see what types of articles you can find using the keywords "interpolation + temperature" or "kriging + temperature".