What does every website visitor have that you need? An email address. Why do you need it? Because professional email list the better your website is at building a list of hot prospects, the more valuable it is to you. Visitors who may professional email list buy from you are hot leads. If you can collect email addresses from those most interested in your offer, you will be building your target market that you can reach independently of their time on your site. Nielsen is one of the most highly respected authority on website design for improving use. He's like the founding father of professional email list website usability. He raises this very point about professional email list email in: "10 high-profit re-design priorities" where he lists the most important ingredients to sales and profits for a business website (link below). Keeping in touch with your visitors once they leave your site is just about the best thing you can do for return professional email list on investment, says Nielsen. Newsletters"...keep customers informed and in touch with the company; websites give customers detailed information and let them perform business transactions." So you can send newsletters to bring your customer back to your professional email list site to buy. He's not the only prominent researcher professional email list with this idea about collecting visitor emails so you can keep in touch. But he's so influential; we'll just go with that and agree it's a great idea So how do you implement this newsletter idea? This is also called list-building (you're building a list of email addresses from visitors). Or lead-capture. Nielsen doesn't spell out is what it takes to get people to professional email list sign up for your email list. collects the visitor email addresses in a database for you. More important, it enables each person who signs up to also change or cancel their subscription professional email list independently.