If you mark a question as required, it means that the respondent can not submit the survey if they forgot to answer this required question. If the respondent tries clicking on the submit button without answering a required question, an error message will pop up asking the respondent to answer the required question.
Create a required question:
- Select the question you would like to make required in your survey
- Tick the box labelled Required in the right column
The question will have an asterisk next to it when it has been made a required question.