There are many different variations of your URL that will take you to the same Amazon listing, but the major search engines want to be told they are all the same and which one you prefer. Let’s take a look at this listing:
The following variations would all take you to the same listing even though the URLs are different:
http://www.amazon.com/dp/B00FO9ZRZ0/ http://amazon.com/BalanceFrom-All-Purpose-Anti-Tear-Exercise-Carrying/dp/B00FO9ZRZ0/ http://www.amazon.com/yoga-mat/dp/B00FO9ZRZ0/
If Amazon didn’t let the search engines know all these URLs are really the same, the search engines would consider them to be different pages, even though they all look exactly alike and have the same content. This would make it difficult for them to know which URL to rank for a keyword search.
So, as I mentioned above, having a canonical URL is basically telling the search engines that these URLs all represent the same page, but there is one “preferred” URL that should be used for SEO purposes.
Let’s go back to our yoga mat listing example above. If we check out the source code
If you do a page search for the term “canonical”, you’ll find the following code setting the canonical URL:
<link rel="canonical" href="http://www.amazon.com/BalanceFrom-All-Purpose-Anti-Tear-Exercise-Carrying/dp/B00FO9ZRZ0" />
Now the listing title for this product is:
BalanceFrom GoYoga All-Purpose 1/2-Inch Extra Thick High Density Anti-Tear Exercise Yoga Mat with Carrying Strap
If you look at the listing title, you’ll see that Amazon pulls words from there to create the canonical URL.
Note: There may not be a 100% overlap in words between the title and canonical URL if the seller has changed their listing title since it was originally created.
Unfortunately, there’s no known way to have the canonical URL use the keywords you want, but it’s a good idea to be aware of what your canonical URL is and use that when posting links to your product anywhere (including with the Super-URL).
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