what is unnatural link in SEO? please share your views...

Which gives the bad impact to the search engines !

Exposing a link selling network in a matter of minutes as we all know by now, a big part of the major blog link networks were de-indexed by Google shortly before the penguin update. I'll show you how you can uncover a big link network in a few minutes (without joining the network). We'll use just the information that's displayed on a networks front page and results from reports we got from Link Research Tools.

1. Pick a target site and let's find out if this is a link network.
2. Run target websites through back link profiler
3. Find suspicious links to the website
4. Run suspect "Link sellers" -> Link Juice Thief
5. Run "Link Buyers" -> Common backlinks tools
6. Remove and avoid bad links to this network!

1. Pick a target site and let's find out if this is a link network.
2. Run target websites through back link profiler
3. Find suspicious links to the website
4. Run suspect "Link sellers" -> Link Juice Thief
5. Run "Link Buyers" -> Common backlinks tools
6. Remove and avoid bad links to this network!

Unnatural links are those which are created in spammy websites using the different techniques that might be black hat techniques.