What is 'f.hidden_field' for?

Ruby newbie. Can anyone tell me the purpose of f.hidden_field?
hidden_field
Mark_CoAsked:
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Steven HarrisConnect With a Mentor PresidentCommented:
'f.hidden_field' is a hidden form field.  This is commonly used to pass a variable in a form without it actually displaying and is normally combined with ajax/javascript.
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