Whenever you are doing any work, we must do it under some pre-defined rules and regulations. If those rules are not followed then there is an associated penalty to it.
Likewise, in SEO, while doing any promotional task for your website, certain rules have been established by search engines that must be followed. But there are some people who do not follow these rules. Besides this, they adopt some wrong means to give their website a boost in the search engine result page which includes duplicate content, cloaking, hidden text, etc. We have discussed these entire topics in the coming section.