This document provides information about federalism and its key features. It begins by defining federalism as a system with dual levels of government - a central authority that oversees major national affairs and local governments that handle day-to-day regional activities. Some key features of federalism discussed are that both levels of government govern the same citizens but have distinct jurisdictions, the constitution prescribes the federal system but requires approval of both levels for important amendments, and conflicts between levels can be resolved by the judiciary. The document also lists some merits like diffusing power and increasing participation, and demerits such as protecting majority will and allowing opposition between government levels.