Email marketing is one type of online marketing that is most popular marketing service at this days. People are interested about this because, they got awesome service from this way. So, if you are an online businessman or you have a site that you want to promote you can choose this marketing way for you. In email marketing you need to send email about your service to people and they will be your traffics. So, easily you need this peoples email address who are interested about your service. You need to create a list of email where you will send your offers that's call email marketing lists.