What does the Majestic Citation Flow SEO metric mean

Citation Flow is a Majestic SEO metric that reflects the quantity of backlinks to a domain or URL. As low quality backlinks are abundant in the link profiles of spammed domain names, high Citation flow is not always a good thing. High Citation Flow is good only when the Trust Flow (reflecting links quality) is also high.

This is why Tool.Domains filters use Citation Flow only as a signal for potentially spammy backlink profile.