This report offers a comprehensive overview of Enterprise Resource Planning (ERP) systems, covering their architecture and diverse modules. It explores three main architectures: three-tier, web-based, and service-oriented, and then delves into various ERP modules such as finance, human resources, production, customer relationship management, and supply chain management. The report also highlights the advantages of ERP systems, including data storage in a usable format, secure customer data, centralized systems, and improved performance and decision-making. Conversely, it addresses the disadvantages, such as high installation and maintenance costs, the need for a skilled workforce, and the complexities of implementation. The report provides valuable insights into the practical aspects of ERP systems and their impact on business operations.