SetUpTestData and setUp TestCase methods in Django

Can anyone explain me the differences between setUpTestData and setUp TestCase methods in Django?

Documentation says.

*The class-level atomic block described above allows the creation of initial data at the class level, once for the whole TestCase. This technique allows for faster tests as compared to using setUp().

Be careful not to modify any objects created in setUpTestData() in your test methods. Modifications to in-memory objects from setup work done at the class level will persist between test methods. If you do need to modify them, you could reload them in the setUp() method with refresh_from_db() *

And a piece of code...

from django.test import TestCase
class MyTests(TestCase):

   @classmethod
   def setUpTestData(cls):
      # Set up data for the whole TestCase
      cls.foo = Foo.objects.create(bar="Test")

   def test1(self):
      # Some test

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