For questions related to Sitecore's Rules Engine feature, which facilitates the processing of conditions and actions in Sitecore for personalization and other features, both native and custom
Sitecore’s Rules Engine provides the ability to evaluate conditions and perform actions that is usable for business users. Using the Rules Engine provides a consistent means for configuring complex, rule-based business logic within Sitecore.
http://sitecore-community.github.io/docs/documentation/Sitecore%20Fundamentals/Rules%20Engine/
