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Sencha Upgrade Advisor, Sencha Architect, IDE Plugins, and Sencha Themer all now support Ext JS 7.7. Ext JS follows the Model-View-Controller (MVC) architectural pattern, which helps in separating the data logic, user interface, and application logic. It includes a powerful data package called Ext.data, which enables developers to work with data from various sources, such as RESTful APIs, JSON, XML, and more.