What's the difference between WordPress Registration, BuddyPress Registration and Member Regist

I am now completely confused. Figured this deserved it’s own support question.

I have a WordPress site with a BuddyPress & Membership Plugins. Each one has registration capabilities. Can you please explain this process to me?

Which one can I use? Can I use BuddyPress registration as well as Member Registration at the same time? For ex: User registration for the site as well as Member registration for a paid subscription?

Where would these registration pages be controlled and how to I see them on the front end.

Sorry if I’m asking what would seem to be obvious questions, I’m just new to BuddyPress as well as Membership plugin.