Search engine optimization (SEO) is the process of affecting the visibility of a website or a web page in a search engine’s “natural” or un-paid (“organic”) search results. In general, the earlier (or higher ranked on the search results page), and more frequently a site appears in the search results list, the more visitors it will receive from the search engine’s users. SEO may target different kinds of search, including image search, local search, video search, academic search, news search and industry-specific vertical search engines.

Basically there are 3 Types of SEO Techniques:-

1. White Hat SEO:-

White hat SEO is the technique, In that we have to follow the rules of different type of search engines. And make sure the articles that we are posting should be according to the Title, doing this will increase your ranking in search engines. In search engine optimization (SEO) terminology, White Hat SEO refers to the usage of SEO strategies, techniques and tactics that focus on a human audience opposed to search engines and completely follows search engine rules and policies. For example, a Web site that is SEO optimized, yet focuses on relevancy and organic ranking is considered to be optimized using White Hat SEO practices. Some examples of White Hat SEO techniques include using keywords and keyword analysis, back linking, link building to improve link popularity, and writing content for human readers White Hat SEO is more frequently used by those who intend to make a long-term investment on their Web site. Also called Ethical SEO.

2.  Black Hat SEO:-

Black hat SEO is a technique which is the opposite of white hat SEO. In search engine optimization (SEO) terminology, Black Hat SEO refers to the use of aggressive SEO strategies, techniques and tactics that focus only on search engines and not a human audience, and usually does not obey search engines rules. Some examples of Black Hat SEO techniques include keyword stuffing, invisible text and doorway pages. Black Hat SEO is more frequently used by those who are looking for a quick financial return on their Web site, rather than a long-term investment on their Web site. Black Hat SEO can possibly result in your Web site being banned from a search engine, however since the focus is usually on quick high return business models, most experts who use Black Hat SEO tactics consider being banned from search engines a somewhat irrelevant risk. Black Hat SEO may also be referred to as Unethical SEO or just  spamdexing, as spamdexing is a typical frequently used Black Hat SEO practice.

3.  Grey hat SEO:-

Grey Hat SEO is the combination of both White Hat SEO & Black Hat SEO. Perhaps this is also the transformation from white to black or black to white Hat SEO.

Note: – To bring more Traffic very fast on your webpage black hat SEO is powerful but search engines may suspect the activities.