How google differentiate between paid and general links

 

In my last post,i advised you not to sell links because they can do much harm than good.You can even loose your Pagerank. Things are changing now so buying link is no longer a better idea.I am providing these information so that you can understand the new tactics of Search Engines and can maintain your ranking and traffic.Google is a major search engine in the world and it covers 65% of search results on internet.After my last post,i have got so many mails where peoples were asking about the tactics used by Google to differentiate between paid and General Links.I am trying to clear your queries through this post.