Interpolation
In many domains of science, measurements are done. If these measurements are drawn in a graph, they will be shown as simple unconnected points. Such data are called data points, or discrete. Handling and analysis of the data is easier, if it can be described using a continuous function, or a line connecting the discrete data point together. In order to do this, the line between two measurements, or data points, need to be created. This process of connecting the data points together with a line called interpolation. There are different ways to invent the data,  each method has its benefits and drawbacks. The simplest method is  drawing a straight line between two data points, which is not very accurate. Very often,  polynomials are used  to create a more accurate representation. Even if some of the data is wrong, in many cases,  the results of this interpolation are usable, either as a replacement for missing data points, or as a tool to help understand more complicated data.