Shopify is a popular eCommerce platform that makes hosting an online shop easy, while Klaviyo is a marketing automation platform that helps businesses keep in touch with customers via email or SMS. With Zapier, users can create automated workflows called Zaps to connect these two platforms and streamline their business-critical workflows. By setting up a Zap, users can automatically add Shopify subscribers to Klaviyo for new purchases, ensuring timely follow-up messages. The process involves creating a trigger in Shopify, testing it, and then setting up an action in Klaviyo to add new subscribers, customizing the data mapping, and finally testing the action. Once set up, every new Shopify customer will be automatically added to the selected Klaviyo List.