This document provides an overview of email marketing. It discusses why email marketing is an effective and cost-efficient way to market to customers, noting that email has one of the lowest costs per lead compared to other marketing methods. It also reviews best practices for email marketing, such as building permission-based email lists, writing clear and relevant content, and following legal requirements regarding consent. The document demonstrates how to set up an email marketing campaign using the free MailChimp platform, covering steps like creating an account, building email lists, designing campaigns, and sending test emails.