A questionnaire is a written set of questions designed to gather information from people. Think of it like a survey you might fill out at school asking about your favorite subjects, what you like for lunch, or how you feel about recess. Businesses use questionnaires to learn what customers want. Scientists use them to collect data for research studies. Doctors might give patients questionnaires about their symptoms and medical history.

A questionnaire differs from a simple conversation because the questions are planned in advance and often given to many people in exactly the same way. This helps ensure everyone gets asked the same things, making it easier to compare and understand the answers.

You might encounter questionnaires when signing up for activities, visiting a new doctor's office, or when your teacher wants feedback about a field trip. Some questionnaires ask you to check boxes or circle numbers (like rating something from 1 to 10), while others give you space to write longer answers. The goal is always the same: to collect information in an organized way that helps someone make better decisions or understand something more clearly.