Definition
Load balancing is a technique used to distribute incoming network traffic across multiple servers or resources. This distribution ensures that no single resource becomes overwhelmed, thereby improving application responsiveness and availability. It works by using a load balancer, which acts as a single point of contact for clients, intelligently directing requests to available backend servers based on various algorithms. This is crucial for maintaining system uptime and preventing performance degradation during peak usage periods. For instance, a popular e-commerce website uses load balancing to handle thousands of concurrent customer requests, ensuring a smooth shopping experience. While sometimes confused with simple network routing, load balancing actively monitors server health and capacity to make intelligent traffic distribution decisions. This concept is fundamental to many IT certifications, including CompTIA Network+ and AWS Certified Solutions Architect Associate.