Google Disavow Tool is an advanced feature that is used to tell Google to ignore certain
backlinks or even domains when calculating your PageRank score and reputation. The tool
should be used with caution; if treated carelessly (say, you mistakenly disavow links
from good sources), it may badly harm your performance in search results. To use it, you
need to place all the links you want to discard into a disavow file first.