Should I have both username and email for registration/sign up?

It is common practice. The email is needed in case the user forgets their password, and for reply notifications, etc. The username is a familiar handle that isn't their email address, maybe their online pseudonym. You can log the users in via email or username, as you're relying on them entering the correct password.

1. Should I use email or username for login?
2. Should username be your email address?
3. Is username and email address same?
4. What is username in registration form?

Should I use email or username for login?

Usernames Are Used Across Sites

If your login has an email only field you can benefit as well. Allowing users to log in with a username would help users who forget which email they used to sign up. Users have many email addresses and can't always remember which ones they used for which sites.

Should username be your email address?

Don't make your e-mail address your user ID

Using your e-mail address to sign into accounts has its benefits. Your ID is unique and easy to remember, and it makes it simple for a service to contact with you when, say, you forget your password. But in some cases, the risks of doing so could outweigh the benefits.

Is username and email address same?

The username is the name you choose to be identified with for e-mail purposes and that you have provided to the e-mail host to create your e-mail account. The domain name is the internet designation for the e-mail host, which may be a private site, company, organization, or government entity.

What is username in registration form?

The user name in CET Application login is generally the name through which you have created your user id on the platform.