Black hat SEO - definition
SEOs are considered “black hat” if they’re using using doubtful techniques to enhance rankings in the SERPS (Search Engine Result Pages) - this is also called Spamdexing.
Common black hat seo practises - Spamdexing
Spamdexing - definition:
Generic term for the techniques used to get pages indexed in the Search Engine Result Pages using fraudulent methods
Spamdexing includes:
- link spam
(placing links to their websites on other webpages without admission)
- blog spamming
- wikipedia spamming
- forum spamming
- content spam
(altering the logical view a search engine has over the website’s content)
- cloaking (showing different versions of their websites to Search Engine Robots than to human surfers)
- meta tag stuffing (repeating the same or adding irrelevant keywords in the html meta tags)
- keyword stuffing (filling the website with keywords in a high density, unrelated to the site content)
A Black hat SEO - how does he look like?
No, Black hat SEOs do not wear black hats usually, black hat SEOs might look just like you and me. Recently, I have seen one, here’s his hat, check out the picture 
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