A checkbox question is similar to a multiple choice question except that it allows respondents to specify many of the choices as part of their answers rather than just 1 choice. Sometimes, this question type is referred to as Multiple Choice, Multiple Answer.
How to Use:
In order to use a Checkbox Question, simply drag it from the list of questions (on the left side of your survey editor screen) and drop it onto the right side of your survey editor (where you see a live preview of the questions).
Once the question has been added, you can view the question options on the left side.
Watch this video tutorial on Checkbox questions:
More information here.