Description: The term ‘In Service’ in the context of load balancers refers to instances that are currently receiving traffic from the load balancer. This means that these instances are active and operational, ready to handle user requests. The primary function of a load balancer is to distribute network or application traffic evenly across multiple server instances, which helps optimize resource usage, maximize performance, and ensure application availability. ‘In Service’ instances are crucial for maintaining service continuity, as any instance not in this category will not receive traffic, potentially impacting user experience. Additionally, the ‘In Service’ status allows administrators to monitor instance performance and make adjustments as necessary, ensuring that the system remains efficient and reliable. In summary, ‘In Service’ instances are an essential component in modern application architecture, where scalability and resilience are fundamental to operational success.