Couchbase Mobile 2.0 is a NoSQL JSON Document Store that enables developers to build mobile applications with offline-only and offline-first capabilities for iOS, Android, and .Net platforms, supporting flexible deployment options such as standalone embedded databases or synchronized data between clients and servers. The tutorial covers the basics of using Couchbase Lite in standalone mode within Xamarin apps, covering database operations and document create, update, and delete operations. With Couchbase Mobile, developers can build mobile applications that seamlessly switch between online and offline modes, providing a robust solution for modern mobile app development.