An ezine is an electronic newsletter sent out by email at intervals of your choice to a list of opt-in subscribers. Opting in means they have voluntarily signed-up to receive your ezine and were not added to the list without their knowledge or permission. Ezines are very important to your business because they allow you to keep in contact with your potential customers and advertisers. Providing a good ezine with effective content can also build your credibility and also your reputation. Along with good content you can also promote your products and services. In essence, the ezine is the lifeline between your prospects and your business.