Before you proceed with this article we recommend that you read Logic and Flow Overview article if you have not read that already.
Rules contains conditions and decision. You can define more then one condition. Each rule can only have one decision.
Question condition is set by questions. You can also specify if all or one condition needs to be met for rule to be evaluated true (By AND/OR) in-between conditions.
Collector condition is used when you want to participants to jump directly to a particular question if participant is coming from a particular deployment type.
E.g. You may want to skip welcome page and take user directly to first question if participant is providing you a feedback by clicking link from email.
Decision is instruction of what to do when condition is rule is evaluated as true. There are two types of decisions.
Jump to a question
Jump to a question will jump user to specified question when condition for rule is evaluated true.
Terminate Survey will jump user to end page and end the survey when condition for rule is evaluated true.