What is the difference between Sink and Stream in Flutter?

Question

The Google I/O 2018 video about Flutter explains how to use Dart streams to manage state in a Flutter application. The speaker talked about using Sink as input stre

Answer 1

A StreamSink is a StreamConsumer, which means it can take several streams (added by addStream) and processes the events these streams emit.

If it is the StreamSink of a StreamController then all events from the added streams are emitted by the stream created by the StreamController.

This way you can pipe (forward) one or more streams into another one.