Parliamentary Secretaries

There is an Hon'ble Minister in charge of a Department in every State, and there is a Secretary of the Department (a bureaucrat).

I recently read that a state governemt has appointed a number of "Parliamentary Secretaries". My impression is that their pay and perks are at par with those of the Hon'ble Ministers.

But what work are the Parliamentary Secretaries supposed to be doing?

Don't ask me .....