Dependent checkboxes behaviour

1. Where are checkboxes used?
2. Which defines a checkbox?
3. What is checkbox and radio button?

Where are checkboxes used?

Checkboxes are used when there are lists of options and the user may select any number of choices, including zero, one, or several.

Which defines a checkbox?

: a small box (as in a checklist) in which to place a check mark (see check entry 2 sense 7) to make a selection, indicate completion of a task, etc.

What is checkbox and radio button?

Checkboxes and radio buttons are elements for making selections. Checkboxes allow the user to choose items from a fixed number of alternatives, while radio buttons allow the user to choose exactly one item from a list of several predefined alternatives.