Email marketing is the act of sending a commercial message, usually to a group of people, by e-mail. Any email sent to a prospective or current customer could be considered to be email marketing in its broadest sense.
Easy to share.
Easy to measure.
Easy to get started.
Deliver targeted messages.
Reach an already engaged audience.
Low costs. One of the most obvious advantages of email marketing is its lower cost compared to mainstream marketing channels..