Black hat SEO is common name for whole bunch of unethical techniques and procedures which can be applied to improve positions of our pages in rankings of search engines. Although search engines try to improve their algorithms from day to day, many of them still work and it is very likely most of them will be used for many years if not for ever.
The reason for this is simple. Search results are actually nothing else than list of most popular competitors. If we have a competition, we have at least few candidates who want to win. Cheating was always among mot popular way for winning and introduction of internet didn't change that.
Even if we want to stay under white hat, we should be aware of black hat SEO techniques which should be understood - to beat competitors, to learn from their mistakes or innovations - and ultimately - to win the rankings.
So here is my...