This document provides an overview of federalism as an aspect of constitutionalism in India. It discusses the key federal features of the Indian constitution, including the division of powers between the union and states. It outlines the legislative powers distributed between the union and states through the union list, state list, and concurrent list in the seventh schedule. It also discusses some of the principles for interpreting these lists, including the doctrines of colorable legislation and territorial nexus. The document serves as an introduction to federalism in India and the constitutional division of powers between the central and state governments.