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System Design · Concept

Load Balancing

A load balancer distributes client requests across upstream servers. It can improve performance and availability, but it adds complexity and can become a failure point if deployed alone.

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  • Active-passive
  • Active-active
  • Layer 4 load balancing
  • Layer 7 load balancing
  • Horizontal scaling
  • Reverse proxy (web server)
  • Load balancer vs reverse proxy

Source: system-design-primer/README.md at master · donnemartin/system-design-primer · GitHub. Checked 2026-11-03.