(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.