Sub-domains
When you use Sub-domains as Portal Sites, you should know that one of the best uses of sub-domains is portal websites. Portal websites are sites that link to your main website and have a similar theme, for example, if your website is about selling cars, your portal website would be about car parts. Basically, they provide another portal, or doorway, for visitors and search engines to get to your main website. So if someone input a query about car parts, the search engines would send them to your website that is about cars. Do you see what I mean?
Since creating content for a website takes time, often webmasters simply modify the existing text of the main site and reuse it on the portal site. It is important that the content is not exactly the same and that the portals do not just redirect the visitor’s to the main site. Otherwise, search engines may not index them.
