What is negative SEO??

[dougbollenger]

There are different ways of SEO works and the black hat SEO techniques are the negative mode of the search engine optimization which works with wrong links and spammed links that are brought in from copied contents of different sites.

[jamsen]

Negative SEO can take a couple of different forms but in general, it refers to someone purchasing links, unnatural links, that are then aimed at a website belonging to a competitor in an attempt to negatively affect their ranking in search engine results.

[HostMe]

According to me negative seo is like to promote site with a unethical meathod and against a google search engine Guidelines. It contain many thinks like buying links, link farm etc

[mikeslough5]

Duplicate content, excess of link building, and irrelevant work must be count in negative SEO.

[JerrickYeoh]

Negative SEO is which SEO efforts that will bring negative effect toward SEO like black hat SEO .
Spam on link building with the same anchor text, build link building with automate, poor quality content and keywords, over optimize keywords in content & spamming all are nagative SEO methods.