Negative SEO is any malicious and unethical practice aimed at sabotaging the search rankings of a competitor's website. This technique, usually used by malicious webmasters, can seriously harm a website's rankings in search results. For this reason, webmasters must perform controls on a regular basis to see if their website is under attack by malicious individuals. One of the most common negative SEO techniques is to give backlinks to the competitor's website from inappropriate and irrelevant websites. Webmasters should regularly check backlinks to their website and report harmful links to Google using the Google Disavow Tool.