Working with Data in Ext JS focuses on managing, binding, and manipulating data efficiently within enterprise web applications. It enables developers to build dynamic, data-driven interfaces with seamless integration between frontend components and backend services. This training explains core concepts such as stores, models, proxies, and data binding mechanisms. It also covers CRUD operations, data loading, caching strategies, remote data integration, and performance optimization techniques. You will learn how enterprises use Ext JS data architecture to build responsive dashboards, grids, and business applications. The course also highlights best practices for handling large datasets and creating scalable, maintainable web applications.