Black Hat search engine optimization is customarily defined as procedure that are used to get higher search rankings in an unethical manner. These Black Hat search engine optimization techniques are deemed to be sneaky and deceptive and generally practices that are not accepted by the search engines or to break search engine guidelines, such as doorway pages,content generating, keyword stuffing, misrepresenting content, buying links, spam indexing, cloaking, link baiting, data mining, link spamming, and even page rank hijacking.We should not use these black hat seo techniques.
Depending on the competitiveness of a keyword you can see results very quickly. Sometimes within a day - for more competitive terms you can see placement within a few weeks.However,SEO Blackhat is watched closely by the search engines and shows the bad results who use black hat techniques.Black Hats see search engines as the enemy; deceit is the name of the game, seo’s are constantly looking to expose trickery and penalize guilty sites.and finally your site will be banned. Being banned means your site is removed from the index completely from the search engines and the rank gained by these tactics will be finally reduced.
Doorway Page is a procedure of highly optimized web page whose purpose is to direct traffic to target pages using either a code like redirect method or merely by being full of links that direct you to these other web pages and stays as representative to other pages.
Keyword stuffing literally the practice of repeating a keyword in high rate again on a given web page. If search engine suspects there is a good chance they’ll penalize you for it.
Interlinking Setting up various websites for some topic and having them all weblink to each other in order to boost up their relevance and subsequently their rankings in the search engines.
Buying Expired Domains buying expired websites that had some good Page Rank in order to try and keep the sites inbound links.
Cloaking will be technique where a webmaster will have two different copies of a given web page, one copy of page which is shown the search engine spiders and one copy of page is shown to the regular web surfer means showing one page to Googlebot and a completely different page to real human visitors.
Selling Page Rank if you have a high PR website, you sell links from your website to another for money. This in turn leads to boost up the site rank higher in Google.
Invisible Text is the technique of filling a web page consisting of the text that is same color as the background ex: white text on a white background.
Spam Page This page which is encorporated with a bunch of ads or listings of other sites as doorway pages that a webmaster makes money off of if someone clicks on them.