Cloud load balancing distributes incoming network traffic across multiple servers or computing resources to ensure no single resource becomes overwhelmed, improving application availability, fault tolerance, and performance. Operating at various layers of the OSI model (Layer 4 for transport-level and Layer 7 for application-level routing), load balancers are essential infrastructure components for modern cloud architectures, supporting everything from simple round-robin distribution to sophisticated content-based routing with health checks, SSL termination, and cross-region failover. A key distinction to understand: Layer 4 load balancers route traffic based on IP addresses and TCP/UDP ports without inspecting packet contents, while Layer 7 load balancers make intelligent routing decisions by analyzing HTTP headers, URLs, cookies, and application data—this fundamental difference determines which balancer type suits your use case, whether you need raw throughput and minimal latency (Layer 4) or advanced content routing and protocol-aware features (Layer 7).