The disavow link tool is a hidden feature that’s within webmaster tools and can only be accessed by navigating to a specific URL whilst logged into search console or by requesting it via Google search, e.g: disavow tool into Google.
The disavow tool was created by Google to provide webmasters with a way of defending themselves from malicious links or negative SEO attacks on the web. The disavow tool, in essence, can be used to tell Google that your website isn’t associated with a set of URL’s and not to take these links into consideration when calculating where your site should rank in the search results. The tool needs to be used with care, as making one minor mistake can seriously damage the integrity of your domain. It’s a tool that can be used to recover from a Google penalty also, as you will be required to clean up your link profile if you ever encounter one.
You can access the disavow tool here.
I wouldn’t recommend disavowing any link, conduct your research first and ensure that the link is being problematic before proceeding with a file submit – otherwise you may lose juice that’s contributing to the success of your search engine rankings. I personally prefer to use SEMrush and Majestic for link analysis.
If you’re certain that a link is causing issues for your site, you’ll need to compile a file that outlines the URL’s you are disavowing and the reasoning behind why you are submitting that particular URL. It is recommended that you get in touch with the webmaster first, to see if you can resolve the issue, before proceeding with a disavow upload.