difference between blackhat and whitehat
 

difference between black hat and white hat in seo

White hat SEO is the improve the ranking in organic way and follow the google guidelines.And Black hat SEO is not follow the google guidelines.Google Consider the SPAM.

greay hat is a tricky seo,where as black is pure spam

White Hat SEO helps to increase your site ranking traffic & ranking, safe from Google updates while not black hat.

The difference between black hat SEO and white hat SEO has to do with the techniques used when trying to improve a website’s search engine ranking.
Black hat SEO refers to techniques and strategies used to get higher search rankings, and breaking search engine rules. Black hat SEO focuses on only search engines and not so much a human audience. Black hat SEO is typically used by those who are looking for a quick return on their site, rather than a long-term investment on their site. Some techniques used in black hat SEO include: keyword stuffing, link farming, hidden texts and links, and blog content spamming.

White hat SEO refers to the use of techniques and strategies that target a human audience opposed to a search engine. Techniques that are typically used in white hat SEO include using keywords, and keyword analysis, doing research, rewriting meta tags in order for them to be more relevant, backlinking, link building as well as writing content for human readers. Those who use white hat SEO expect to make a long-term investment on their website, as the results last a long time.

There is one most important difference between Black hat and White hat seo technique is Black hat doesn't follow google guidelines whereas White hat follow google guidelines.

Black hat SEO is a practice that increases a page's rank in search engines through means that violate the search engines' terms.
White Hat - White hat SEO refers to the usage of optimization strategies, techniques and tactics that focus on a human audience opposed to search engines and completely follows search engine rules.

If I give the job of SEO for my website to a person/company, how do I know what method is being used. Is there any way to detect if black hat or white hat SEO is being done.

White hat methods are those that follow webmaster guidelines, whereas black hat methods do not follow the guidelines. Therefore following black hat techniques can risk your website to search engine penalties.