The Central Secretariat is the nerve centre of the administrative system at the Union level in India. It is the principal policy-formulating and coordinating agency of the Government of India and serves as the administrative headquarters of various ministries and departments. It provides the institutional framework through which the political executive translates its vision into governmental policies, laws, programmes, and administrative actions. The Secretariat acts as the link between the political leadership and the executive agencies responsible for implementing government policies. While the ministries formulate policies, the attached and subordinate offices, autonomous bodies, and public sector undertakings implement them under the overall supervision of the Secretariat. The Central Secretariat evolved during the British colonial period and expanded significantly after Independence due to the growing responsibilities of the welfare state. The Constitution of India envisages a parliamentary system of government in which ministers are politically responsible to Parliament, while permanent civil servants assist them in the discharge of their official duties. The Secretariat embodies this constitutional principle by providing continuity, expertise, neutrality, and administrative support to successive governments. The organisation of the Central Secretariat is ministry-based. Each ministry is responsible for a particular area of governmental activity such as finance, defence, education, home affairs, agriculture, health, commerce, external affairs, and transport. Some ministries are divided into two or more departments to facilitate efficient administration. For example, the Ministry of Finance consists of departments dealing with expenditure, revenue, economic affairs, financial services, and investment and public asset management. Every ministry is headed politically by a Cabinet Minister. Depending upon the workload and importance of the ministry, the Cabinet Minister may be assisted by Ministers of State or Deputy Ministers. The political executive determines policy priorities, represents the ministry in Parliament, and takes final decisions on major matters. The administrative head of a ministry is the Secretary to the Government of India. The Secretary is usually a senior officer of the Indian Administrative Service or another All India or Central Service. As the principal adviser to the minister, the Secretary provides expert advice on policy matters, ensures administrative efficiency, supervises departmental functioning, and coordinates with other ministries. The Secretary is also the chief accounting and administrative authority of the ministry. Below the Secretary, the Secretariat follows a hierarchical organisational structure. Additional Secretaries assist the Secretary in managing broad functional areas. Special Secretaries may be appointed in ministries requiring specialised attention. Joint Secretaries are responsible for specific wings or divisions and enjoy considerable autonomy in policy formulation and coordination. Deputy Secretaries and Directors supervise branches dealing with specialised subjects. Under Secretaries supervise sections and ensure timely disposal of files. Section Officers manage individual sections, distribute work among assistants, scrutinise cases, and maintain discipline. Assistants, Senior Secretariat Assistants, Junior Secretariat Assistants, and other supporting staff perform clerical, record management, drafting, correspondence, and data-processing functions. The Secretariat follows a well-defined system of divisions, branches, and sections.