Black Hat SEO

         Black Hat SEO is basically achieving SEO traffic and ranking targets in less time with the help of wrong SEO techniques. Also Black hat has various other ways to make your webpage better in all type of search engines.
 This is a type of unethical seo. Black hat is basically done for short time results and spamming.

• Black hat basically is breaking rules and regulations of search engines.
• Visual and non-visual changes in web pages in coding or using some tags.
• Unnecessary linking and interlinking of web pages.
• Excessive keyword stuffing which is spamming only.

So while doing natural seo please avoid above methods. Because black hat seo will not help you to make your presence better on web. It will ruin all your efforts.
keyword stuffing, doorway pages and invisible text are popular black hat techniques.