India has one of the fastest growing economies in the world, ranked 4th globally by PPP in 2001. Its economy is driven by agriculture, manufacturing, and services industries. Economic development depends on increasing efficiency, technological progress, and a shift away from agriculture. Historically, India's economy has progressed through pre-colonial, colonial, and post-colonial phases. It faces challenges like poverty, unemployment, population growth, and rural-urban disparities but is addressing these through reforms and investment in infrastructure, education, and technology. If current growth continues, India may become a developed economy by 2020-2025.