black hat ? what is that ? and why webmasters must know it ? is it bad or good ? how, why , who ..etc all this questions about blackhat or black hat you must know very well so you Avoid banning from search engines and others traffic sources .

i faced last week a new updates in Alexa and Google page rank , this was for good , actually i didn’t noticed the page rank change at the time it updated but i noticed it after 3-4 days from updates .