Mobile apps often need to work offline (no/poor connectivity) and sync data when connectivity returns. This involves local data storage, detecting connectivity, queuing changes, and synchronizing — a challenging but important aspect of robust mobile apps.
Why offline support matters
Mobile devices have UNRELIABLE connectivity (no signal, poor network, airplane mode):
→ apps that break/are useless offline frustrate users
→ OFFLINE-FIRST apps work regardless of connectivity → better, more robust UX
→ Handle: reading cached data offline, making changes offline, syncing when back online.
