Stream

Core-neutral message middleware
No need to deal with the messaging middleware, focus on the messaging itself
Channels as programming abstractions representing message destinations
Steeltoe Stream automatically configures channels for you and connects them to external messaging systems through middleware-specific binder implementations

Binders

abstraction used by Steeltoe that enables Stream-based application services to integrate with external messaging systems
includes the responsibility for connectivity, delegation, and routing of messages to and from producers and consumers
support for data type conversions, invocation of the application code responsible for processing messages
implement the boilerplate code

bridge between the external messaging system and application-provided methods which act as producers and consumers
EnableBinding attribute
ISource(producer)
ISink (consumer)
IProcessor (both Sink & Source)