SEO tactics
Disavow
Disavowing is used to optimize the link profile of a site. If a site has many low-quality, spammy inlinks, the site owner can disavow those links. It's asking Google not to take those links into account.
Disavowing is normally only required when Google issues a manual action, telling you there are many low-quality links to your site.
always be very careful when disavowing, as you might remove valuable links.
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