What Is Email Marketing [2025 Beginner’s Guide]

Email marketing is still the highest-ROI channel in 2025, but most people are using it wrong. In this quick-start guide, you’ll learn what email marketing really is, why it still outperforms social media and ads, and how to start building revenue-driving automations from scratch. Whether you’re a founder, marketer, or freelancer, this is the best place to begin.