Subdomains vs subfolders

subdomain.domain.com --> this is subdomain

domain.com/subfolder --> this is subfolder.
 
a sub.domain.com is seen as a new domain as google concerned .

a domain.com/folder named correctly can help with seo work.
 
@Ab Rehman - what are you trying to do ? response could be different. but most of the time sub-folder is better for seo purposes; unless you want to rank similar concept for different cities: orlando.cleaningservices.com ; miami.cleaningservices.com, etc.

if you are blogging, then go sub-folder method.
 
For what? Categories in subdomains for example? Go with directories.
 
Generally speaking, sub-folders are better for consolidating authority in one domain, but you may want to go for a sub-domain if the content will be targeting something completely different from main domain.
 
Sub folder is better option it does help you achieve more authority.
 
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