Email marketing is directly marketing a commercial message to a group of people using electronic mail email. In its broadest sense, every email sent to a potential or current customer could be considered email marketing. It usually involves using email to send ads, request business, or solicit sales or donations, and any email communication that is meant to build loyalty, trust or brand awareness.
Email marketing can be done to either cold lists or current customer database. Broadly, the term is usually used to refer to: sending email messages with the purpose of enhancing the relationship of a merchant with its current or previous customers, to encourage customer loyalty and repeat business, sending email messages with the purpose of acquiring new customers or convincing current customers to purchase something immediately, adding advertisements to email messages sent by other companies to their customers.