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guides/store-retrieve-messages.md
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# Retrieve Messages Using Waku Store # Retrieve Messages Using Waku Store
When running a web dApp or a mobile phone application, DApps running on a phone or in a browser are often offline:
internet can be unreliable and disconnect. The browser could be closed or mobile app in the background.
[Waku Relay](https://rfc.vac.dev/spec/18/) is a gossip protocol. [Waku Relay](https://rfc.vac.dev/spec/18/) is a gossip protocol.
As a user, it means that your peers forward you messages they just received. As a user, it means that your peers forward you messages they just received.
If you cannot be reached by your peers, then messages are not relayed; If you cannot be reached by your peers, then messages are not relayed;
relay peers do **not** save messages for later. relay peers do **not** save messages for later.
However, [store](https://rfc.vac.dev/spec/13/) peers do save messages they relay,
allowing you to retrieve them at any time. However, [Waku Store](https://rfc.vac.dev/spec/13/) peers do save messages they relay,
allowing you to retrieve them at a later time.
The Waku Store protocol is best-effort and does not guarantee data availability.
Waku Relay should still be preferred when online;
Waku Store can be used after resuming connectivity:
when the dApp starts for example.
In this guide, we'll review how you can use Waku Store to retrieve messages. In this guide, we'll review how you can use Waku Store to retrieve messages.
Before starting, you need to choose a _Content Topic_ for your dApp. Before starting, you need to choose a _Content Topic_ for your dApp.
Check out the [how to choose a content topic guide](choose-content-topic.md) to learn more about content topics. Check out the [how to choose a content topic guide](choose-content-topic.md) to learn more about content topics.