Why Are Employees Across the Country Protesting Against NPS?

Why are government employees across the country opposing the NPS and demanding restoration of OPS?

Why are government employees across the country opposing the National Pension Scheme (NPS) or New Pension Scheme? Why they are demanding for restoration of Old Pension Scheme (OPS)? What is the difference between the two? Will this affect the upcoming elections results? To know watch this video of NC Decodes: