Hello mems I m planning to launch few subdomains from main domain which are of different niche. So If I promote them separately, Does it make any difference to Original Domain or Does Google Do anything? Is it Bad to do that? Thanks
Subdomains are seen as outbound links on a page so you will give PR juice to them as if they were outbound links. If they link to your pages back you will get inbound links again.
The more you have pages the likely the PR juice is distributed.....Consequently the PR is affected.. so build more IBLs than OBLs on your pages...
subdomains is like another content added on your main domain. there is no problem adding subdomains just be sure to maintain them regularly.
Subdomains are considered external links and not internal. Subdomains with unique content will be considered it's own website and not a part of the primary domain. If each subdomain has a link back to the primary domain you will in fact have pr juice from the subdomains HOWEVER.. I wouldnt recommend this approach unless your site is viable and has a good reason to use the subdomains to achieve this. You may be penalized if your site does this more for an advantage than a valid reason. Unless your website has a specific reason it needs subdomains we'd recommend steering from it as it can go two ways.