Enter all of your bad links now:
A disavow file is a .txt file that contains instructions to Google. It is used to let them know that you’d like them to ignore a bunch of links that are pointing to your website, usually because they’re having a negative impact on your site rankings, or could do.
A great disavow file contains both root domains and links to individual pages along with comments detailing your removal attempts for each of the links, where necessary.
Example of a Good Disavow File:
# Negative SEO Attack - ALL SPAM Domains
# Made Contact: 06/10, 10/10, 18/10 with No Response
# Directory Network - Trying to Charge for Link Removals
When Should You Submit One?
If your rankings have suffered recently, or even if they haven’t but you think they may in the future then it’s probably a good idea for you to consider submitting a Disavow file.
You can submit a Disavow file if:
Always remember, a good link follows Google's guidelines. A bad link does not. A bad link is simply one that violates Google's guidelines. Consequently, it can lead to Google penalties.
An example of bad links may be: Link farms, paid links, link wheels and other black hat link-building techniques that many webmaster or SEO Professionals tend to use so they can improve their site or clients' site ranking on Search Engines.