Email marketing is the process of marketing your product or service by sending emails to your subscribers or prospects.  This is a cost effective way of reaching to your prospects.  It is believed that more than 75% of marketers worldwide use email to promote their products or services.  The return on investment or ROI also is believed to be very high for every dollar spent in the case of email marketing.  An email marketing service helps you in building your email list with ease and precision.