Hidden fields are very useful when you want to save data but does not want to be visible for the users. These are defined in the Studio selecting the checkbox Hidden. In that way, the field is not available to select in the records grid, however, the changes in the value of the field are still visible in the History section of the record.
Benefits / Value
The field is not visible in any way, as stated in the documentation:
|Hidden||If selected, the field is visible only in the Fields Editor.|
In the Studio, at the Fields section, there is an option to select in case the hidden field should not appear in the History section.