Do you have spammy (or unnatural) links pointing to your web page? Google penalize you for having unnatural links that violate their quality standards. The best way to resolve this is to remove the links by contacting the originating site, but what do you do if they don't respond or resist to remove? This is where disavow file comes into play to let Goolge know that those links contained in the file aren't my responsiblity.

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