Salesforce Shield is a Salesforce add-on product that can be used for the agency’s compliance use cases. Salesforce Shield provides enhanced security, data protection, and auditing capabilities for the agency’s implementation. It includes three features: Platform Encryption, Event Monitoring, and Field Audit Trail. Platform Encryption allows the agency to encrypt sensitive data at rest while preserving critical platform functionality. Event Monitoring allows the agency to track and audit user activity and performance across the platform. Field Audit Trail allows the agency to track changes to sensitive data fields over time and set retention policies for field history data. Reference: https://trailhead.salesforce.com/content/learn/modules/public-sector-solutions-design/secure-data-with-platform-encryption