# Hidden Question

Much like the [hidden field](https://docs.ngsurvey.com/form-management/form-designer/answers/answer-types/hidden-field) answer type the hidden question  is a question that is part of the survey while the respondent takes it but which is not visible. 

The hidden question can be used to collect data through [piping](https://docs.ngsurvey.com/form-management/form-designer/piping/text-data-piping) or make calculations that are no shown to the respondent.