A cellular jail is a special kind of prison where the inmates are kept in small, separate cells.
Imagine that you have a big room that needs to be divided into smaller sections. In this case, the room is the prison and the sections are the cells. Each cell is only big enough for one person and has a bed, a toilet, and a chair.
The walls of the cell are very thick, and a small window with bars on it is the only way for the prisoner to see outside. The purpose of these cells is to keep the prisoners isolated from each other so that they cannot communicate or plan ways to escape.
This isolation can be very difficult for the prisoners because they do not have anyone to talk to or interact with for long periods of time. Some of these kinds of prisons were used by the British during their rule in India, particularly in the Andaman and Nicobar Islands.
Overall, the purpose of a cellular jail is to prevent communication among the prisoners in order to maintain the security of the prison and to punish inmates through long-term isolation.