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Google Keep uses a combination of local storage and synchronization to allow users to access their notes even when offline. Here's how it generally works:

1. Local Storage:
   - Google Keep stores a copy of your notes locally on your device. When you create or update a note while online, the app also saves a version of that note locally.

2. Synchronization:
   - When your device is online, Google Keep synchronizes your notes with Google's servers. This ensures that any changes made on one device are reflected on other devices connected to the same Google account.

3. Offline Access:
   - Even when you're offline, you can still access the notes that are stored locally on your device. You can view and edit these notes, but any changes made while offline won't be reflected on other devices until a network connection is reestablished.

4. Background Sync:
   - When your device connects to the internet again, Google Keep automatically syncs the changes you made while offline with the server and updates the notes on other connected devices.

5. Conflict Resolution:
   - If conflicting changes are made on different devices while offline, Google Keep uses a conflict resolution mechanism to merge or choose the most recent changes.

This synchronization approach is part of Google's broader strategy for cloud-based services, ensuring that users have access to their data across various devices and that changes are seamlessly propagated. The offline functionality allows users to continue working with their notes even when there's no internet connection, with changes getting synced when connectivity is restored.