Why would georeferencing be with real-world data (and give an example of this)?

Question

Quizplus · Accepted Answer

The Answer is Georeferencing can be used to take datasets that do not have spatial reference and apply this spatial reference to them by aligning the data with referenced datasets.If data does not have a spatial reference (such as a set of plans or a hand-drawn scale diagram),it cannot be used in conjunction with other data layers in other forms of geospatial technology (for instance,it will not match with other data in a GIS,or will not properly align with a remotely sensed image).An example of this would be to take historic maps of an area and georeference them with current maps to see how areas have altered or changed over time.

Why Would Georeferencing Be with Real-World Data (And Give an Example