ATG Scenarios and Targeters different

Sr.no	Scenarios	Targeters
1.	Scenarios are triggered by events.	Targeters are not event based.
2.	If we want to personalize content as a result of a site visitor's doing something specific (for example, logging in), use a scenario.	The business rules we can set up through Targeters are more flexible in some cases than scenarios. For this reason, if we need to set up highly complex rules to match content  to  visitors, use Targeters.
3.	Scenarios use a feature called slots to display dynamic content. Slots provide some powerful advantages over Targeters (for example, we can set up empty slots that generate their own requests for content).	Targeters don’t use slots.
4.	If we want to set up a long-term approach to content and visitor management, use scenarios.