Do I need to use rel canonical in a blog?

[EcommerceSite]

I work at an ecommerce site and we are in the process setting up a blog. Do I need to use rel canonical what talking about a certain category? If I sell widgets and write a blog about widgets should I use that tag? Or is there something else I should do?

[TakeshiYoung]

It's always good to include a canonical tag, because different versions of your URL could get indexed. If you are using Wordpress for your blog, it should generate the tag automatically.

[EvolveCreative]

I'm not exactly sure what you're asking, but if two different URLs contain the same content then yes you should use the canonical tag. Here's Google's help page on the topic:

http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394

[EcommerceSite]

The URLs will be very different. Current structure is www.site.com/category/item The blog will be www.site.com/blog/blogposttitle the URLs will not be close but the keywords throughout the page will be.

[EcommerceSite]

I have read that page and this is why I have the confusion. The URLs will not be close, the content will be very different, but the keywords will be similar. If I sell widgets and also have a blog post about widgets the content is very different between the two but bot have similar keywords.

[EvolveCreative]

If the content is different you don't need a canonical