A disavow file is a .txt format file you submit to Google. It contains a list of
backlinks you want to discard. This file contains instructions on whether you want to
disavow the harmful link only or the whole domain. If you choose to disavow a link, you
will keep receiving backlinks from that domain in the future, and these links will count
to your PageRank. In case you decide to disavow the whole domain, you will not be able
to get any backlink from it until you remove restrictions.