Google Give a Warning Message of unnatural links according to penguin. I don't know the solution of this problem, how to find unnatural links, how to remove these linbks. Kindly give me the solution for this. Google Message attached below "Google Webmaster Tools notice of detected unnatural links" Dear site owner or webmaster, We've detected that some of your site's pages may be using techniques that are outside Google's Webmaster Guidelines. Specifically, look for possibly artificial or unnatural links pointing to your site that could be intended to manipulate PageRank. Examples of unnatural linking could include buying links to pass PageRank or participating in link schemes. We encourage you to make changes to your site so that it meets our quality guidelines. Once you've made these changes, please submit your site for reconsideration in Google's search results. If you find unnatural links to your site that you are unable to control or remove, please provide the details in your reconsideration request. If you have any questions about how to resolve this issue, please see our Webmaster Help Forum for support. Sincerely, Google Search Quality Team"
You first check all backlinks of the site. Then pick out and remove all the links which come from non-relevant sites. Google does not like links obtained from non-relevant sources. Try to obtain quality backlinks from good sites.