Link velocity refers to the rate at which a website or webpage acquires new backlinks over a given period of time. In other words, it measures the speed at which a website is acquiring new links.
It is usually measured in links per month or referring domains per month.
A sudden increase or decrease in link velocity can signal to search engines that a website may be engaging in manipulative link building tactics or experiencing a penalty, which can impact search engine rankings.
A healthy link velocity will depend on the age and authority of the website. Newer websites may have a slower link velocity while established websites may have a faster link velocity due to their existing authority and backlink profile.