When to use the Disavow tool of Google?

[globalhearthospital]

The Disavow tool is part of Google Search Console (formerly Webmaster Tools) that allows websites to discount the value of an inbound link, helping to prevent link-based penalties.

[Alex Jones]

Google's disavow tool allows webmasters to notify Google of poor-quality links pointing to their website that they do not want associated with their site. This helps SEOs tell Google which external links to be considered when Google evaluates ranking factors.