How to prevent registration from login page and login from registration page

1. What comes first registration or login?
2. Is login and Registration same?
3. What is registration and login page?
4. What is registration authentication?

What comes first registration or login?

Registration only happens the first time you access the system. It is a way to check your credentials. Every time after your initial registration, you will log on to the system using the username and password you created.

Is login and Registration same?

Registering for something sometimes involves paying money, while signing in or logging in to something usually does not require a payment.

What is registration and login page?

A signup page (also known as a registration page) enables users and organizations to independently register and gain access to your system. It is common to have multiple signup pages depending on the types of people and organizations you want to register.

What is registration authentication?

To register means creating a new user account, that is a record in the database describing how you will prove your identity. To authenticate you means providing evidence that your identity matches the one described in your user account.