It also provides information about shared words, and the corresponding area of the origin of Indo-European, and the specific vocabulary which is to be ascribed to specific regions.
It is part of the Kurgan-hypothesis/Revvised Steppe Theory.
Historical linguistics provides the main basis for the theory, analysing the development and changes of languages, and establishing relations between the various Indo-European languages, and the time frame wherein these languages developed.
In the present technology-driven society, laptop or notebook has been a part and parcel of our daily life.
We do a lot of activities on it to make our life more comfortable and hospitable.
This led to the idea that this migration was actually an aggressive invasion which caused the decline of the Harappan Civilisation.