The checkbox element is a set of options, in the form of a dropdown. The user can select multiple options, not just one.
In addition to the basic element properties, the muti-drop element allow for the following:
Choices for the multiple choice element allow the form creator to separate the text displayed to users from the values stored upon form submission. The pipe ("|") character separates the visible text from the stored value (i.e. Yes|1).
Use Case Considerations:
Checkbox elements are best used when the user input can be one or more of a predefined set of values. The element allows the user to select any number of choices from the options. Due to its UI configuration and multiple selections, the multi-drop element cannot be linked to a PowerSchool field.
Intermediate Elements Documentation