The post provides a detailed guide on integrating Couchbase Lite as an embedded database within an iOS app and its extension, specifically focusing on a Today Extension, which acts as a widget in the Notification Center. It uses Couchbase Mobile v1.4, though the content is applicable to version 2.0 as well. The guide assumes familiarity with Swift and Couchbase Lite integration, offering a practical example through a demo Task List app where tasks can be managed directly from the widget without opening the app. The key to enabling data sharing between the app and its extension lies in utilizing a Shared Container via an App Group, ensuring both components can access the local database. Essential setup steps include configuring App Group capabilities and managing database paths through a singleton class in Swift, highlighting how tasks are stored, accessed, and updated across both the container app and the widget. The author also encourages exploring the sample code for further insight and hints at future posts expanding the focus to include cloud synchronization.