(Saikia, 2023).
Migration is a topic that has virtually always piqued the interest of social scientists as how people moves and the causes and consequences of it. The movement of people is merely one basic way of portraying it. However, there are many studies on this issue, that the meaning of the term ”migration” is recognised; but the little attention is devoted to this specific definition. Three fundamental components are necessary to understand the idea of migration definition: Change in residence, spatial boundaries, and time. The UN multilingual dictionary defines “Migration” as a form of spatial mobility between one geographical unit and another, involving a permanent change of residence”. Selective migration flows are also regarded to be a fundamental mechanism by which the intended benefits of the target area flow out to attract the migrants.
Of all demographic components, migration is considered to be the most complicated phenomena to be documented. Together with the Census of India, the Civil Registration System, other surveys undertaken by Ministries of the Government of India such as the National Family Health Survey, Longitudinal Aging Study in India, National Sample Survey, and others are used to record the population type and their socio-economic, health and other situations. Yet, relatively few researches and surveys for migration statistics are conducted at the national level. Kerela Migration Study (KMS) , Middle Ganga Plains Survey(MGP) , and Gujarat Migration Survey (GMS) are being done to gain a general understanding of the migratory movement, although each has some limitations. As a result, the Census is the sole source of migration statistics to be reviewed and analysed.