Email marketing is one of the most profitable direct marketing channels, generating an average return on investment (ROI) of about $36 for every $1 spent in 2021. Good email marketing informs your customers, drives sales, and builds a community for your brand through sending a newsletter, for example. However, if you want to simply send emails, any tool can handle this task. To take things to the next level and make email marketing personal, you need Klaviyo, the next-generation email marketing tool.