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在这段代码中解释了下面提到的代码块的工作

from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from django import forms

class NewUserForm(UserCreationForm):
    CHOICES=(
        ('Doctor','D'),
        ('Patient','P'),
        ('Manager','M')
    )
    email = forms.EmailField(required=False)
    username = forms.CharField(required=True)
    phone = forms.IntegerField(required=False)
    role = forms.CharField(widget=forms.Select(choices=CHOICES))
    password1 = forms.CharField(required=True)
    password2 = forms.CharField(required=True)
    

    class Meta:
        model = User
        fields = ("email","username","phone","role","password1","password2")
    
    def save(self,commit=True):
        user = super(NewUserForm,self).save(commit=False)
        user.email = self.changed_data['email']
        if commit:
            user.save()
        return user

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请解释一下
def保存和类Meta，这里.保存（commit=False）有什么用。