Hiden Content and Link in black hat
White Hat is the ethical process and Black hat seo is an unethical process.
White Hat is an ethical way of doing the SEO techniques where as Black Hat is an unethical practice.
White hat is obeying terms and condition of search engine black hat is not obeying the terms
White Hat Hat is an moral way of doing the SEO methods where as Black Hat is an unethical practice.