The document defines infrastructure and discusses various sectors that are considered part of infrastructure including economic infrastructure (energy, transport, telecommunications, special economic zones, urban and rural infrastructure) and social infrastructure (human development, health, education, employment, women's empowerment, empowerment of disadvantaged groups). It provides details on key infrastructure sectors in India like power, railways, roadways, telecommunications, oil and gas. It also discusses policies and definitions of infrastructure from organizations like RBI, IRDA, Economic Survey and Income Tax Department.