Roles include front-line ASHA/ANM/Community Health Officer (CHO), public health nurse, programme officer in health NGOs, and technical specialists (epidemiologists, M&E). Work locations are community health centres, district health offices, hospitals, and NGO field sites. Public health roles focus on disease control, maternal & child health, immunisation, and health systems strengthening. Training may be on-the-job (for ASHAs), diploma/degree (DHS/ANM), or postgraduate (MPH) for technical roles.