This document defines slums according to various organizations and censuses, and describes the characteristics and types of slums in India. It defines slums as informal settlements with substandard housing and lack of basic services, as per the Census of India, World Bank, and WHO. It also provides definitions from other sources. The document outlines the three main types of slums in India - notified, recognized, and identified slums. It describes the characteristics of slums such as overcrowding, lack of infrastructure, and insecure land tenure. Finally, it summarizes various government policies and schemes to address slums over different 5-year plans in India.