Email marketing is a digital marketing strategy that involves sending commercial messages to a group of people via email. It is an essential tool for businesses because it is cost-effective, builds customer relationships, allows for targeted messaging, is easy to measure, and has a high ROI.

By using email marketing, businesses can stay in touch with their customers on a regular basis, providing updates, promotions, and other valuable information. This helps build customer loyalty and keeps them engaged with the brand. Email marketing campaigns can be easily tracked and measured, providing valuable insights into what works and what doesn't, which businesses can use to optimize their campaigns for better results.

Overall, email marketing is a powerful and effective way for businesses of all sizes and industries to reach their customers, build relationships, and drive sales. With the right strategy and execution, businesses can use email marketing to achieve their marketing goals and stay ahead of their competition.