Email read rate refers to the percentage of emails that are opened and read by recipients out of the total number of emails sent. It is a measure of the effectiveness of an email campaign and indicates the level of engagement and interest from the target audience. A high email read rate is a positive indication that the email content is relevant and engaging, while a low read rate may suggest that the email was not well received or that the subject line and preview text were not enticing enough. Email read rate is an important metric for businesses and marketers to track in order to evaluate the success of their email marketing efforts and make necessary improvements.