Small scale industries in India are defined as those with investments of less than Rs. 1 crore. They provide extensive opportunities for employment and production. SSI's contribute over 40% of industrial production and create the largest number of jobs after agriculture. Food products, non-metallic minerals, and metal products are the top employment generating industries. The government promotes and supports SSI's through policies, subsidies, training, and reservations to boost their role in the Indian economy.