# Hidden Question Much like the [hidden field](/form-management/form-designer/answers/answer-types/hidden-field.md) 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](/form-management/form-designer/piping/text-data-piping.md) or make calculations that are no shown to the respondent. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.ngsurvey.com/form-management/form-designer/questions/question-types/advanced-types/hidden-question.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.