Good question! We already had a feature called "greeter" that was on par with snapengage's proactive chat. Targeting is something bigger.
Targeted chat lets you take a variety of actions other than just automatically starting conversations (label visitor, hide chatbox, show chatbox, route to operator/group) based on a wider variety of conditions about the user (too many to list here).
Take it for a spin and let me know if you have any more questions! Always happy to help.