eCommerce email marketing is a strategic use of email to promote products, build relationships, and drive customer engagement. It targets a highly specific audience, making it effective for converting prospects into customers and increasing loyalty. The benefits include high ROI, increased customer retention, direct communication, immediate results, and personalized content. To create effective emails, focus on quality over quantity, segment your list, use AI tools to personalize and automate, leverage trending topics, and supplement other marketing channels. Key metrics to track include open rate, click-through rate, conversion rate, bounce rate, and unsubscribe rate. Popular email marketing tools for eCommerce include Klaviyo, Omnisend, Mailchimp, ActiveCampaign, HubSpot, and Brevo. By following best practices and leveraging technology, eCommerce businesses can unlock the full potential of email marketing to drive sales and growth.