In SAP, the role concept refers to a mechanism for managing and controlling user access to system resources and transactions. Roles define sets of authorizations that determine what tasks and data users can access within the SAP system. Instead of assigning individual authorizations to users, administrators assign roles to users based on their job responsibilities or functional roles within the organization. Each role contains a collection of authorizations, which are permissions to perform specific actions or access certain data objects within the SAP system. The role concept helps simplify user management, ensure compliance with security policies, and minimize the risk of unauthorized access to sensitive data or transactions.