what is questionnaire in research methodology ?

A questionnaire in Research methodology is a tool used to acquire information by asking respondents a sequence of established or semi-structured questions. It may be used in both qualitative and quantitative studies, depending on the kind of questions asked. Closed-ended questions yield quantitative facts, at the same time as open-ended questions provide qualitative insights. Questionnaires are usually used for surveys and are a green manner to accumulate data.