domain question- ____.mysite.com

wxdqz

New Member
ive been programing websites and learning html, css, javascript, php, ect.. for a few months (definatly not an expert yet) and i have a website. I understand that any subfolders under my htdocs folder add a subdirectory to the sites url. ex- mysite.com/directory/file

Now i keep seeing on websites...
subsite.theirsite.com
i was wondering how to do this.. The only thing i could think of is buying a domain thats subsite.theirsite.com but that dosent seem right knowing webhosting sites immediatly impliment a subsite onto theirs.

Can somone help me do this?
 
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