Form I-797 is used for various types of communication known as 'notice of action'. It's not a form you fill out. Rather, it's a form that is mailed to you by the USCIS to notify you of certain action that's been taken on your case.
Often, our customers receive this commonly as a receipt notice, which contains the USCIS case number, which can be used for checking the status of your case online.
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