Streams are a way to look at the decision path of a customer. You start with picking a conversion point. Then you select channels. QD will then show you the activity of the people who have converted in those channels, prior to their conversion. You can even select how many days you want to look back on.
Basically, a stream is a rewind button for your customers’ journey.
Don’t forget: you can click “Save” to save this page to a report, so you can use it later.