Email writers use their knowledge of human behavior and psychology to create content that drives people to take action. They work for companies and brands who want their customers to do things like sign up for newsletters, take advantage of sales, enter contests, and take surveys. They implement a call to action that gets people to follow their lead. Email writers know the importance of A/B testing and use their knowledge of comparison to test the outcomes. They understand that, in addition to a great sale, you must also have actionable words that drive people to follow through.