AMF is a binary protocol data transfer client server applications used by some Adobe Flash. The optional Adobe Flex / AMF (Action Message Format) to test support applications programmed with Adobe Flash technology Adobe Flex and using the application protocol AMF.

There are several variants of the binary AMF protocol:

AMF0: this version is used in Flex applications programmed in ActionScript 1.0 and 2.0.

AMF3: Adobe introduced the protocol very close to AMF0 from ActionScript 3.0. This protocol allows the exchange of objects created by the developer of the application between the client and server.

The following video show the performance of AMF.

For more information: AMF 3.0 Specification