Reverse SEO
 

Reverse SEO or Negative SEO is the practice of taking actions for decreasing the rank of a page or website in Google and other search engine pages. Some people work, using all un-ethical practices to build spammy links, 100% same anchor text, to hurt a competitors' site. It is better to work to make your website optimization properly instead of wasting time to work on other websites. I hope this is useful.