In short
A low-level, transactional browser database for storing large amounts of structured data client-side — far more capable than localStorage for complex offline data.
How to learn this
- 1Store a small structured dataset in IndexedDB using the raw API or a wrapper like `idb`.
- 2Compare its capabilities (indexes, transactions, large storage) to localStorage.
- 3Learn it's the storage layer most offline-first apps and PWAs rely on.
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