What is Black Hat SEO?
 

Can anyone here, who knows completely about it?

black hat seo is the term in which doorway,keyword stuffing,cloaking,duplicate content etc are in the black hat seo. that is use for the rank the site on the top of the search in less time.but google danied all these activity.so that site that use this terms get penalty by the google

Black Hat SEO is a technique of increasing keyword ranking on Google. But This is opposite from Google SEO Algorithm.

Black hat SEO is the way of SEO which ignore the guidelines of Search engine. Black hat SEO strategies is banned by the search engine. website who follow the black hat SEO strategies should going to be penalized by search engine.

black hat seo you says spamming both are similar.

Black Hat seo is the method to increase a page's ranking in a search engine result page and include some techniques such as keyword stuffing, doorway pages, adding unrelated keywords and invisible text.

Black hat SEO include:-
1. Keyword Stuffing.
2. Put same color text of background, like if we have white site background and use white color text.
3. Use hidden anchor tag

Black hat SEO means don't follow the search engine rule i.e. just for increasing rank do stuffing of keyword,use duplicate content. By this it chances to website is permanently block by search engine.

It is considered as an unethical seo and it should not be followed

black hat seo is done by software which is unethical, and seo expert don't follow it.