A site may record the buying habits of a particular user and use this to recommend products or target specials interests from the front page of the site. When users arrive at the Web site they are greeted by name, obtained via a simple cookie. If they search for an item the database will return not only that item, but a list of similar items that the user may be interested in. There are privacy issues of course, but if a company is serious about building relationships with its customers online they are more likely to protect privacy rather than abuse it. It always pays to include a privacy statement on your site - explain what information you collect, how you collect it, and what you intend doing with it.
Many sites make use of email to attract visitors back to their Web sites and develop a community.
It's common to find these options on Web forms for various sites and they are used for everything from daily news updates, regular special deals and discounts, and notification of new products. There are many sites that will give advice on running email mailing lists. Here's three vital tips Never reveal the email addresses of your mailing list. Listbot and List.to both offer free mailing list services. Secondly, put some thought into what you're sending out in your emails.