Black hat SEO is a whole series of unethical actions aimed at improving the readability of a website by crawlers in a way that does not comply with search engine regulations. Proving a site uses such methods by a search engine usually results in a ban or, in milder cases, moving the site further down the search results.
The most common methods include black hat SEO include:
- invisible links and hidden text,
- doorway pages (pages displayed in search results for specific keywords, but which in fact lead to places on the web unrelated to the subject of the query),
- cloaking (displaying different content to users than to robots),
- duplicate content,
- blog spamming,
- link farms,
- generating content of no value to the user.