In Django, request.POST is a dictionary-like object that contains the data submitted in a form as part of a POST request. The data is stored as key-value pairs, where the keys are the names of the form fields and the values are the data submitted by the user.

The difference between request.POST['username'] and request.POST.get('username') is that the first one will raise a KeyError if the 'username' key is not present in the request.POST dictionary, while the second one will return None or a default value if the key is not present.
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