Disavow

The disavow links tool lets you submit a list of URLs or domains whose links you want Google to ignore when assessing your site. Google describes it as an advanced feature that should be used with caution, because using it incorrectly can harm your site's performance in search.

Google recommends disavowing only when both conditions apply: you have a considerable number of spammy, artificial or low-quality links pointing to your site, and those links have caused, or are likely to cause, a manual action. It also notes that most sites will not need the tool, because Google generally works out which links to trust on its own.

Random spammy links that every site accumulates are usually not a reason to disavow. The typical use case is a site that previously bought links or ran a link scheme and has received, or expects, a manual action. In that case, try to remove the links first, then disavow what can't be removed.