A form will also contain labels which describe the various input boxes.
The layout of the form is just as important as what it contains. The user must be able to work out what input is required and valid, and what input is optional.
Validation of the input must be carried out prior to the data being submitted to the application. (See validation, input-fields)
Form also refers to a physical questionaires on paper in which to fill in data by writing or printing.