In SAP, STRUST (SAP Trust Manager) is a transaction used for managing digital certificates within the Secure Network Communications (SNC) framework. SNC is used to secure communication between SAP systems and other applications or systems. Within STRUST, administrators can import, export, and manage digital certificates used for authentication and encryption purposes. These certificates can include SSL server certificates, client certificates, and public key infrastructure (PKI) certificates. STRUST provides a central interface for configuring and maintaining the trust relationships necessary for secure communication between SAP systems and external entities.