What's the benefit to adding a subdomain?

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I understand the benefit of adding portal pages tuned to different
engines.  However another SEO recommended to my client that they create
a separate subdomain, with just a few words in the description changed.
   They described it as going from widgets.com to automobile.widgets.com.

This just sounds mixed up to me.  Subdomains don't have descriptions,
pages do.  Or am I missing something?  Is repeating content in a
subdomain a beneficial tactic?


Chip Off the O'l Proc
Thats 'cessor not 'tology

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