The primary purpose of network monitoring tools is to ensure the performance and reliability of a network. These tools provide real-time data regarding network traffic, latency, and throughput, helping to identify issues such as network congestion, outages, or unauthorized access. By monitoring various network components like servers, routers, and switches, IT professionals can proactively address potential problems, optimize resource utilization, and enhance security. This continuous oversight is crucial for maintaining optimal network functionality and supporting efficient business operations.