A load balancer is a system that distributes traffic across multiple servers or services to improve performance, resilience, and availability. It matters because traffic distribution and service front ends influence both uptime and security architecture.
What is a Load Balancer?
A load balancer sits in front of applications or services and decides how incoming traffic should be directed among available backend resources. It may use health checks, policies, geography, session logic, or protocol awareness to guide traffic decisions.
While load balancers are often discussed for performance and availability, they also affect how security inspection, TLS handling, application exposure, and denial-of-service resilience are implemented.
What Load Balancers Commonly Handle
Common responsibilities include health checking, traffic distribution, failover, TLS termination, session persistence, request routing, and support for high-availability application design.
Load Balancer vs. Reverse Proxy
A reverse proxy fronts applications and mediates requests, often adding security or routing logic. A load balancer focuses more specifically on distributing traffic across backend resources. Some products combine both roles.
Frequently Asked Questions
Why does load balancing matter for security?
Because the front door to an application often influences visibility, TLS management, DDoS resilience, segmentation, and how security controls are placed in the request path.
Does a load balancer itself secure an application?
No. It can improve architecture and resilience, but secure coding, WAF protections, access control, and other application defenses still matter.
