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, backlinking, 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.
White Hat SEO is Ethical SEO method, It is good method to optimize the page, by this method we achieve a long term website ranking.
White Hat is the use of ethical SEO tactics, following rules and policies laid-down by Search engines. As digitallake said ''White Hat SEO is more frequently used by those who intend to make a long-term investment on their Web site'' Playing the system can get fast results in regards to SERPs but at the end of the day this will do you more harm than good.