Email list refers to the list that consists of a list of emails of target consumers. It is also called as opt in email list as it consists of emails of people who have opted on or subscribed to receive newsletters or emails related to a particular service or product. For instance, if someone is interested in websites related to make up products then she may subscribe with such opt in email list. The list is maintained by the online media company which sells it to the advertiser. So if you own a makeup website then you can get that email list and send your marketing mails to them. Since the consumer has shown his interest in receiving information related to your site, the email would be useful to him and he is likely to click on it to visit your site. This is how you can use the email list to get quality traffic at your website. The advertisers who prefer to use direct marketing or email marketing for promoting their website prefer to buy the email list as that helps them to get the right traffic at their site. The advertiser can buy email list through a reliable online media company that collects and maintains updated information.