The process of building an email list is called as list building.  The very purpose of list building consists in the collection of the names and email addresses of visitors to your landing page that show interest in your product or service.  The aim of list building is to contact your prospects with a view to sending information about your product or service so you can generate leads for your online business.  List building always proved successful in the sense that it is done with an intention to drive targeted audience to your landing page so the subscribers turn into buyers in the long run.  An email marketing software assists you in the process of list building with precision.