Is a repeat password field necessary in a signup page? [duplicate]

1. Why do users need to provide their password twice?
2. Do you need a confirm password field?
3. What is the confirm password?

Why do users need to provide their password twice?

It is to avoid typos. If you have to type the password twice chances are you'll make your password what you want. They want to avoid having people whose password is "blah" having to retrieve their password later on because they typed "blaj" by mistake.

Do you need a confirm password field?

Only a small percentage of users mistype their password, but the confirm password field makes all users do extra work. If you want users to do something in your app, make it easier to do. This is especially important for the signup form because users have nothing invested in your app so far.

What is the confirm password?

Whenever a user creates a password, there is always one more field of confirm password. It checks that the password entered by the user is same as this confirm password fields. To create a valid password, both the password and confirm password fields value must be matched.