A Network Load Balancer is a device that distributes incoming network traffic across multiple servers. This helps ensure that no single server becomes overwhelmed, improving the overall performance and reliability of applications. By balancing the load, it can enhance user experience and maintain service availability even during high traffic periods. These load balancers operate at the transport layer of the OSI model, typically using protocols like TCP and UDP. They can also provide features such as health checks to monitor server status, ensuring that traffic is only directed to healthy servers, which further optimizes resource utilization and minimizes downtime.