Why do registration flows ask for anything at all?

1. What is a registration flow?
2. How does user registration work?

What is a registration flow?

A registration process flow chart depicts the sequential steps a new user must go through to complete the process.

How does user registration work?

A registered user is a user of a website, program, or other systems who has previously registered. Registered users normally provide some sort of credentials (such as a username or e-mail address, and a password) to the system in order to prove their identity: this is known as logging in.