Its illlegal way of doing SEO... Many webmaster use this technique but Websites can be banned if Google caught them...

Black Hat SEO refers to the use of aggressive SEO strategies, techniques and tactics that focus only on search engines and not a human audience, and usually does not obey search engines rules.

Black hat SEO techniques used to get higher ranking search in an unethical manner. Black hat SEO techniques are:

1. Keyword stuffing
2. Invisible text
3. Doorway pages
4. Hidden link

Black Hat seo is an unfair practice of SEO. This technique can make your site rank better easily but if Google notice it, then your site will get penalized..

Black Hat search engine optimization is customarily defined as the practice of
using unethical techniques to make your search rankings go up.

black hate SEO is not good

ya you right

black hat SEO is not good ,it will give a page rank very fast but with spam backlinks and from hidden links

are you teaching SEO ?

In search engine optimization terminology, Black Hat SEO refers to the use of aggressive SEO strategies, techniques and tactics that focus only on search engines and not a human audience, and usually does not obey search engines rules. Some examples of Black Hat SEO techniques include keyword stuffing, invisible text and doorway pages. Black Hat SEO is more frequently used by those who are looking for a quick financial return on their Web site, rather than a long-term investment on their Web site. Black Hat SEO can possibly result in your Web site being banned from a search engine.

Black hat SEO, one of the process to increase SERP very fast but it is not advisable to follow. Even search engines may penalize your website if it got stick with this method.

Black hat search engine optimization (SEO) refers to controversial SEO methods used to acquire higher Web page search engine rankings

Black hat seo is the unethical process of increaing link popularity and visibility.

Black Hat seo is customarily defined as the practice of
using unethical techniques to make your search rankings go up.

Avoiding the rules of Search Engines and doing over optimization activities repeating keyword stuffing, copy content and bad urls.