A questionnaire is a research instrument consisting of a series of written questions that a researcher supplies to subjects or respondents, typically in a written or digital format, requesting their responses to gather data on their attitudes, beliefs, behaviours, or characteristics. Questionnaires can include various types of questions, such as multiple-choice, true/false, rating scales, and open-ended questions, depending on the research objectives and the type of information being sought. They are a widely used method in survey research for collecting data from a large number of people in a standardised way, allowing for statistical analysis of the responses. The design of a questionnaire, including the wording, order, and format of questions, is crucial for obtaining accurate and reliable data.