There is most common issue in SEO Practices, search engine and website owners that is Canonicalization. Canonical Tag is the best option for dealing with duplicate content pages. Canonical Tag passes the same amount of link juice ( PR, PA,DA) to the destination url. Syntax for canonical tag is <link rel="canonical" href="your destination url" >. One thing kept in mind that canonical tag put in head section of the web page. Canonical is used for following instances: Canonical Tag 1. When dynamic URL generated with every new visit. its depend upon how a user or visitor goes through your website. these type of instances generally occurs in E Commerce websites. example of this instance - Suppose a user come on abc.com and click on product category1 and then after product sub category Finally he would be reached product zzz. url -- http://abc.com?prodcat1?prodcat2=zzz. in other situation if a user directly comes o...