Wikipedia
Dearness allowance
The Dearness Allowance (DA) is a cost of living adjustment allowance paid to Government employees, Public sector employees (PSU)and pensioners in Pakistan, Bangladesh and India.
Dearness Allowance is calculated as a percentage of an Indian citizen's basic salary to mitigate the impact of inflation on people. Indian citizens may receive a basic salary or pension that is then supplemented by a housing or a dearness allowance, or both. The guidelines that govern the DA vary according to where one lives (for example, whether rural or urban).