Do I need separate Webspace for each domain name?

Hi I am a newbie

So the answer to my question may be very obvious to everyone except me!

I have a number of domain names and recently purchased some Web space

For the sake of example assume I have got Six names.

Do I need to purchase Six separate pieces of Web space in order to host those Six different domain names on?

I think I would be correct in saying that All of those Six domain names could be pointed at the same piece of Web space but as each of those domain names would have unrelated subject matter, I am a bit confused as to what I should do.

Your help appreciated.