An ERP system integrates all departments and functions across an organization into a single system. It aims to get, keep, and grow customers by enabling collaborative processes. Implementing an ERP system is a complex process requiring over a year and $10 million on average. It involves defining requirements, designing the system, building it, testing transactions, and putting the system into production. An ERP system provides modules for key functions like finance, production, sales, marketing, HR, and more. The benefits are integration, efficiency, cost reduction, and accuracy, but disadvantages include time spent on implementation and potential security issues.