Shopify Flow is used to create custom workflows that automate tasks in an ecommerce store and across apps, without needing to code. It also lets users connect existing apps together to complete more jobs. Typical tasks carried out by Shopify Flow include automating inventory tasks like reordering and restocking, to managing fraud concerns.
In my experience, Shopify Flow is very easy to use. It is free if you have a Shopify Plus license. At this time of writing, Shopify Flow can already integrate with some 3rd party apps and more is coming. I think there is high growth potential for Shopify Flow.