How do subdomains affect SEO?

[abcdf]

Hi,I am looking at creating multple sites with rich content and te usual advertising. My question comes in respect to domains.

I know I can literally use sub-domains in stead of new domains, but how does that affect my SEO ranking?

Help would be appreciated.

[lizatailor23]

A subdomain is treated as a completely new domain as far as the engines are concerned. That being said, you'd be subject to the theoretical sandbox, etc. The good side of all of this though, is that if you can get your PR up on both subdomains you have double the leverage for future domains/subdomains.

[RichardSmith]

 Hi Friends,

Yeah sub domains can be of great use, but if you have valuable content in them and do back linking for them.

Thanks and Regards
 Richard Smith

Online Reputation Management

[ring2012]

They are just like the branches of a big tree.