hard to describe in one sentence but the engagement programs are focused to build different streams with a lot of emails to qualify the customer.
But just let me link to Josh:
Just read the two links and you will understand it ;)
Hi Nam,Though we can use the default program for nurturing, it still requires more effort to distribute and design the flow of content. Engagement programs reduce this effort. The advantage is that you can focus on creating better content, and let the system worry about distribution. Here's how it's "Smart Streams" can engage better.
Hope this helps!
Thanks Alok and Steffen
Thanks Steffen. Try this slide too as it explains some key differences that Nam noted.