Question logic allows you to crate path for your respondents. For example if respondent selects answer choice A he will be see page 3, if he selects B he will see page 4, if he selects both A and B he will see pages 3 and 4.
To add page logic :
NOTE. You have to divide your survey into pages before you start to design question logic.
Option available in Starter, Standard, Professional and Enterprise plan.