OPC UA Services are organized into logical groupings called Service Sets. Each Service Se t defines a collection of related Services that enable Clients to access specific aspects of a Server's functionality. The Service Sets and their Services are specified in OPC 10000-4. These Service Sets are fundamental to the ClientServer interaction model, providing Clients with the means to discover Servers, establish secure communication, access and manipulate data, subscribe to events, and perform other operations. The availability of specific Service Sets and the Services within them depends on the Profiles supported by the Server. Profiles are described in OPC 10000-7.