Logic is a survey feature that allows you to customize a survey for each respondent. It offers ways to get responses in a more significant way.
Page Skip Logic option allows you to select a page where you want the respondents to move after completing the current page.
Page Randomization - this option reorder survey pages and it will be shown randomly for each new respondent.
Question Randomization - this logic helps you to eliminate question order bias, improve overall data quality and allows you to randomize or flip all of a page's questions, or just a particular set of questions.