NEGEATIVE SEO

We all are using SEO to improve site search engine ranking. Any one aware of negative SEO? and how can it impact on our competitor site?
What is Negative SEO?
Negative SEO is the reverse of search engine optimisation. The aim of search engine optimisation is to increase a site's visibility in the SERPs. With Negative SEO, the aim of the procedure is to reduce a page's rankings in the search results.
What is Negative SEO?
Negative SEO is the reverse of search engine optimisation. The aim of search engine optimisation is to increase a site's visibility in the SERPs. With Negative SEO, the aim of the procedure is to reduce a page's rankings in the search results.