I think white hat technique is best than black hat.Many people like also white hat because its is responsible to reliable your site.

They are useful but for a shot time after that it show bed effects also..

For long term SEO black hat is not effective.Even google can ban you.

If you have a quality site that you will be dedicating time towards, look into White Hat SEO plans. Black Hat is frowned upon and will only work for a limited amount of time. It could also cripple your pagerank and validity towards incoming traffic if it's spammy. Be fair and use White Hat SEO, especially if you have long term goals

Blact hat technique is not useful.. once they gives boost to the site but after that it gives very bad effect on site..

Nice sharing

Definitely a bad idea.

Thank you for this information!

I have seen sites still practice keyword stuffing and they make it high in the ranks for a few days. Then they get buried. i had a keyword stuffer show up on Page 1 of Google at the bottom of a Attorney keyword site I was working on. Several days later I looked for it again and it was pushed back 38 pages. So I have seen the wrath of Google with my own eyes. lol

Doing Black hat is not safe. Yes, it looks like we following Google guidelines. Since doing black hat may bring Good result for you, Sometimes it may fall or penalized by SE. To be safer side, White hat is best ever.

black hat SEO is bad way for website

It is beneficial for technique uses. Thanks a lot.

It is the best method. Thank you so much for more detail.

Most of the people I have come across use black hat SEO for:
1. Hidden content
2. Meta Keyword Stuffing
3. Meta Keywords
4. Doorway or Gateway Pages
5. Link Farming