It is software that enables you to create and send attractive & professional permission-based campaigns/newsletters to stay in regular touch with your customers & prospects and build strong relationships with them to keep them coming back to you. It provides you with tracking capabilities that enable you to know who opened your emails, who forwarded them to friends, who clicked on which links in your emails, allowing you to understand what people are interested in reading about, and tailor your content to get the best response and most business, also you can extract who clicked on which product info in your newsletter and pass it to your sales team to follow up with them and close more deals. And much more fantastic features.