What is black hat and long tail ?

Hi
what the different between Fat head and long tail, exact definition please

thanks

 

Black hat means adding link to high page rank directories by making payment (Paid Links)

Log Tail mean the keywords which are too long is known as long tail keywords (Long Tail)

 

Black hat means against Search Engine rules.
Long tail mean. Targeting long keyword.
like : "what is black hat seo" keyword like this are long tail keyword.
Blackhat are harmful for your website. But longtail keywords are not harmful.

 

Long tail term comes for keywords, some people use long tail keywords to target the specific audience.

 

and fat head?