the difference between white hat and black hat Backlinks

Black Hat backlinks trick the search engine into thinking the website deserves a high ranking position. Nevertheless, there's no doubt the website will fall to the bottom of the rankings just as soon as the search engine is aware of its techniques.
So why do blackhat backlinking technique still exist, I hear you ask. It's true, depending on several factors (mostly how clever/ lucky you are), it may be months before you get caught. But as soon as they do, you will see your search engine ranking plummet.
3 Black Hat backlinking techniques to be avoided!
1. Keyword ********. As you would expect, this means ******** as many keywords (or instances of the same keyword) into the text (including the Meta data) of a given page. If you're not sure where the boundary is, have a read through and check the text reads fluently.

2. Invisible text. It's possible to make text "invisible" to readers by using the same colour font for the font as for the background. However, rest assured that the only text that is important is the text readers can see.
3. Cloaking. It is possible to create pages that change depending on who is viewing them. For instance, the creation of pages that are visible just to search engine spiders - not regular readers.
These top 3 techniques are the start of a long list of Black Hat Search Engine Optimization techniques (including link farms, doorway pages...) to be avoided at all costs if you are in search of long term online success!