This document provides an overview of the sectors of the Indian economy including primary, secondary, tertiary, organized and unorganized sectors as well as public and private sectors. It discusses the classification and nature of activities in each sector. Over time, the importance of sectors has shifted from primary to secondary to tertiary as countries develop. Currently, the tertiary sector contributes the most to India's GDP and employs the largest portion of the population. The unorganized sector employs most workers but lacks benefits and protections.