Having an public app using an login page

Hey guys, how aya?!

I'm having some problems, could you guys help me?

1) It's possible to give access to some people to my app, downloading it, but they need to access through login/password?

2) I'm also looking to give a proper access to each person, per example: "User A, B and C need to have access to database1 and Users Y, X, Z, need to have access to database2, however, their data is not related, because are different companies". It's some way to solve it?

Sorry if it's confusing haha, it's being confusing also to me hahaha
I can provide more info if you guys need.

Thanks a lot,

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Steve
Platinum 5
Platinum 5