# MQTT-based file delivery
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One option you can use to manage files and transfer them to Amazon IoT devices in your fleet is MQTT-based file delivery. With this feature in the Amazon Cloud you can create a *stream* that contains multiple files, you can update stream data (the file list and descriptions), get the stream data, and more. Amazon IoT MQTT-based file delivery can transfer data in small blocks to your IoT devices, using the MQTT protocol with support for request and response messages in JSON or CBOR.

For more information on ways to transfer data to and from IoT devices using Amazon IoT, see [Connect devices to Amazon IoT](iot-connect-devices.md).

**Topics**
+ [What is a stream?](mqtt-based-file-delivery-what-is.md)
+ [Managing a stream in the Amazon Cloud](mqtt-based-file-delivery-managing.md)
+ [Using Amazon IoT MQTT-based file delivery in devices](mqtt-based-file-delivery-in-devices.md)
+ [An example use case in FreeRTOS OTA](mqtt-based-file-delivery-example.md)