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# [Android Components](../../README.md) > Samples > Firefox Relay
## Concepts
The main concepts shown in the sample app are:
* Usage of the `FxRelay` component.
* Login to Firefox Accounts that provides the session token to access Relay api's.
* Getting the list of `RelayAddress` from the `RelayClient`.
## License
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this