Difference between event receiver and workflow?

Ans

Event receiver	Workflows
1) Event receivers in SharePoint can be executed before or after an operation, like before adding an item or after adding an item.	1) workflows can be executed only after the operation happed like after an item added to the list or after an item update.
2) The event receivers in SharePoint 2013 or event receivers in SharePoint 2016 cannot be launched manually. They always attached to a SharePoint object which will run automatically when the event occurs.	2) workflows can be started automatically as well as can be started manually also.
3) You can cancel the operation like adding an item	3) You cannot cancel the action as the item is already added.
4) You can create an event receiver only in Visual Studio	4) You can use any tool like SharePoint designer, Visual Studio, Visio, 3rd party apps, etc.
5) No UI interaction	5) Can use forms like initiation form, association form, etc.
6) Can be run for a very short period of time.	6) Can run for days, weeks or even years.
7) Will not survive after server reboots	7) Will survive after server reboots