List building funnel a.k.a. lead funnel lets you create sign-up pages and send follow-up emails to your contacts. It can be used for getting new leads and engaging the contacts who are already on your list by sending them automated messages.
You can learn more about list building on our blog. Check out these two posts on lead funnels and top email list building ideas. And if you’d like to cover the basics first, here’s our complete guide to marketing funnels.