OSS, or Operational Support Systems, are the set of software tools that telecom companies use to monitor, control, analyze, and manage the technical operations of their network systems. These systems enable network inventory management, service provisioning, network configuration, fault management, and performance monitoring. OSS is crucial for ensuring the smooth operation of the telecom network, maintaining service quality, and providing a reliable communication service to customers. It works behind the scenes to support the telecom infrastructure, enabling efficient service delivery and network optimization.