This document provides an overview and introduction to the Goods and Services Tax (GST) system in India for tax officials. It discusses key aspects of GST including the constitutional basis for GST, the powers of central and state governments to levy GST, the structure and role of the GST Council, principles of levying GST on inter-state and intra-state supplies, procedures for registration, tax invoices, input tax credit, computation of GST liability, and record keeping requirements. The goal is to help participants understand and apply GST concepts in performing their duties.