Laravel extend function with subdomain()

In view file I have following script

@extends(subdomain(), [
    'bodyExtraClasses' => 'page-login layout-full',
    'pageExtraClasses' => 'vertical-align text-center'
])

I am not sure this subdomain() extends which files into register.blade? Also there are two different register url but having same register template.

I know how to extend the master layout but this is new for me. I did some search about it but could not found good guideline or I am still fail to understand it.

Can someone kindly guide me about that I will appreciate it.

Thank you so much.

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