This image shows how Oracle SaaS can be extended by using Oracle Cloud Infrastructure (OCI). Oracle SaaS (including products such as Oracle Fusion Cloud ERP, HCM, CX, and SCM) connects to Integration and Oracle Visual Builder components within one Public Subnet in a VCN. Visual Builder also can be accessed from external systems via the Internet Gateway component of the VCN. Also within the VCN, a Private Subnet contains components such as a Database (accessed by the Integration component in the public subnet), API Gateway (which connects to Visual Builder), Oracle Functions, and other apps.