Flow Template Overview
Flow templates are prepacked reusable flows for various business scenarios. Here is the link to View default templates already available in Microsoft Flow.
There was one of many built in templates to build your flow from scratch for example Sending email to manager, send remainders to myself, Get weather of the current location, and lot more…
Navigate to templates and take a look at it choose your template customize it Save and run your flow with no code.
In SharePoint user are able to create a flow from the modern UI with the help of flow button it suggest the default templates already available in the template gallery.
Microsoft Provides the SDK here and use embedded IFrame source to integrate the Flow button in SharePoint list classic view. It works same as modern User Interface like able to pick the flow templates from classic window.
Create a flow that performs one or more tasks automatically after it's triggered by an event. We can create a Flow without using the default templates.
Below we created the simple approval flow template from the blank template. It triggers the flow when the SharePoint list item has been created then send email to the approve and capture the approval status send it to the initiator who create the item.