Email marketing is the process of selling products through the internet. It starts from the time the prospective buyer sends an email asking for the content and you send an attractive and catchy one to impress him. But, more surprisingly, it doesn't end with the successful delivery of the product he is asking for, but with building a strong relationship with him.
By sending a productive email you are gaining the trust of the customers which will ultimately lead to successful sales of your company's product. So, we can't belittle the significance of email marketing.