Role hierarchies are core to the visibility and access model of Salesforce. They control data access in alignment with the reporting structure of any organization. It means, it ensures that the person placed in a higher role possesses visibility to the records owned by users in the subordinate roles. This technique gives administrators a flexible, scalable approach to manage access by records across different objects while protecting data with robust security. In this chapter, we'll go deeply into the concept of role hierarchies, showing how they regulate access to records, how they function, their advantages and limitations, and some practical application strategies.