Error Detection: It helps to identify and correct any errors in the email content, such as broken links, typos, or formatting issues. Consistency: Ensures that emails are consistent and look professional across various email clients like Gmail, Outlook, and Yahoo. Device Optimization: Allows marketers to see how their email will appear on different devices (desktop, tablet, mobile) and adjust accordingly. Improved Engagement: Helps in enhancing the overall user experience, leading to better engagement rates.