What is the purpose of a "Hidden field" in the tool palette of the Form editor and Survey editor?

You want to save a value in the report of the form, for instance customerid. But you do not want the respondent to see this. You can use a Hidden field.

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It's important to link the hidden field with the database field you like to have in your report.

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With this, you have the ability to add a value to the report, without a respondent seeing it.