the.com/questionnaire
A form that interrogates you politely, then files your soul under demographic data.
means A structured set of written questions used to gather information or opinions from people.
from From French questionnaire, built on Latin quaestio (a seeking, an inquiry) — same root as quest, because both are about chasing answers.
Double nThe French spelling kept both n's; English obliged.
Survey kinQuestionnaire is the document, survey is the whole operation.
Leading questionsPhrasing alone can quietly steer your answer.