The rel="noreferrer" is a HTML link attributes that tells the browser not to send the HTTP referer header to the linked page when someone clicks on the link. The referer header usually contains information about the page the user came from, and some websites use this information for analytics, tracking, and security purposes. By adding rel="noreferrer" to a link, you can prevent the linked site from knowing the URL of the page the user came from your as analytics won't show who refered that link. Instead, it will mistakenly show as direct traffic in your acquisition channels report.