But these do not apply to a clear definition of migration. Therefore, migration is actually the movement of a person or group of people from one geographical unit to another and also occurs across administrative or even political borders. «Migration is a natural phenomenon as old as history itself». Basically, most migration in ancient times was based on the conditions of the country. Since economic activity at that time did not involve large scale, if any, it occurred only on a small scale, as we often hear of the "barter system" or an activity involving the exchange of products. Thus they were able to carry out more personal lay activity in their daily lives. But there is some kind of issue in marriage or many reasons like religious issue could be successful in migrating across the country