What is URL Canonicalization

URL Canonicalization is the process of picking up the best URL when several choices are available. For Example: smartblogtips.com, www.smartblogtips.com and www.smartblogtips.com/index.html are the same page, but to a search engine all three are different URLs. Reason is simple. A Web server can identify all three differently and return different content for each of the URLs. [...]