How Search Engines Fight Link Spam?

[krishnanayak]

How spammers try to circumvent search engine guidelines to obtain high rankings for sites that may not deserve those rankings. Of course, the search engines do many things to fight link spam. please someone share own thought to understand about this.

[TomClarke]

Search engines have done  a remarkable job identifying scalable, intelligent methodologies for fighting spam manipulation, making it dramatically more difficult to adversely affect their intended algorithms. Matrics like Moz's TrustRank, statistical analysis, and historical data, have all driven down the value of search spam and made white hat SEO tactics (those that don't violate the search engines' guidelines) far more attractive.
More recently, Google's Panda update introduced  sophisticated machine learning algorithms to combat spam and other low-value pages, and the search engines continue to innovate and raise the bar for delivering quality results.

[krishnanayak]

Thanks for your Valuable contribution...