This document provides a comprehensive glossary of terms related to e-Invoicing in India, as managed by the Goods and Services Tax Network (GSTN). It defines essential concepts such as IRN, IRP, AATO, GSTIN, and various invoice types like Debit and Credit Notes. The glossary also explains technical aspects like QR codes, JSON format, API, and the e-Invoice schema. This resource is invaluable for taxpayers needing to understand and comply with e-invoicing regulations.