Diferences between HA solutions

Could someone explain differences between Data Guard, Oracle Streams and Golden Gate? One or two sentence will be enough.

For comparison between standby and streams, refer MOS Study Between Oracle Streams and Oracle Data Guard (ID 300223.1)
Streams has three phases: capture the data from redo, propagate the data and apply the data on destination. All these three work on database level.
Golden gate also has three phases: Capture, delivery and manager. The capture is known as extract process. the propagation(delivery) of the data and apply(manager) of the data is done at OS level.
but I still don't understand differences between Streams and Golden Gate. Both are Oracle products and looks like doing the same thing.Golden gate was a third party solution for replication, which is recently taken over by Oracle Corp.
(A very less amount of article available on this)
Regards,
S.K.

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