Black Hat SEO is also renowned as the methods that aren’t approved by search engines and they attempt to minimize the effect of such techniques are Black hat techniques. These techniques are also known as spamdexing.
An SEO tactic is considered as Black Hat or Spamdexing if it has the following features:
- Attempting methods to improve ranking that is unaccepted by the search engines and/or involve duplications.
- Redirecting users from a page that is built for search engines to one that is more human-friendly.
- Redirecting users to a page that wasn’t same as the page, the search engine ranked.
- Serving one version of a page to search engine spiders/bots and another version to human visitors. This is called Cloaking SEO tactic.
- Using hidden or invisible text or with the page background color, using a tiny font size or hiding them within the HTML code such as "no frame" sections.
- Repeating keywords in the meta tags, and using keywords that are unrelated to the website content. This is called meta tag stuffing.
- Calculated placement of keywords within a page to raise the keyword count, variety, and density of the page. This is called keyword stuffing.
- Creating low-quality web pages that contain very little content but are instead stuffed with very similar keywords and phrases. These pages are called Doorway or Gateway Pages.
- mirror websites by hosting multiple websites - all with conceptually similar content but using different URLs.
- Creating a rogue copy of a popular website which shows contents similar to the original to a web crawler, but redirects web surfers to unrelated or malicious websites. This is called page hijacking.
- Try not to indulge in any type of the above activities so as to sustain and improve the rank of your website. Search engines are smart enough to identify all the above properties of your site and ultimately you will be penalized.
to know about white hat SEO read this: SEO techniques white hat and black hat SEO