A load balancer spreads incoming traffic across several servers or resources so services stay available, perform well and remain reliable. It acts as a reverse proxy, sharing user requests for web, application or database services so that no single server is overloaded. Modern load balancers also add security features such as SSL offloading, DDoS mitigation, application-layer firewalling and monitoring of user behavior.
By managing traffic flow, a load balancer supports business continuity, helps avoid downtime and lets services scale during busy periods. For security, it sits between users and your backend systems, hides internal server details and reduces the attack surface. That helps protect sensitive data, keep services available during attacks such as volumetric floods and support zero-trust setups where access is tightly controlled. Deployed on-premises, in the cloud or in a hybrid setup, it is a key part of a secure, well-performing digital service.
Users connect to one address, the load balancer’s, and the load balancer passes each request to one of several servers behind it. It chooses using a method such as round robin, least connections or response time. It also checks the health of every server and stops sending traffic to one that is not responding. If a server fails, users usually do not notice, because the others carry on.
Several of these overlap with a web application firewall and DDoS protection service, so check what you already have before buying more.
Start with the services that must stay available, such as customer portals or payment systems. Work out how much traffic you expect at peak and how many servers must stay online if one fails. Decide whether the balancer will run on-premises, in the cloud or both, and plan for the balancer itself to be redundant, because it can become a single point of failure.
A load balancer is a device or service that spreads incoming traffic across several servers so that no single server is overloaded. It also checks server health and sends traffic only to servers that are working.
A load balancer is a kind of reverse proxy that focuses on spreading requests across several servers. Many reverse proxies also cache content, add security rules or handle encrypted connections. Modern products often do all of these jobs.
It helps absorb and spread traffic, and many include rate limiting or DDoS features. For larger attacks you usually also need a dedicated DDoS protection service. A load balancer on its own is not a complete defense.
Not for balancing, but a load balancer can still add health checks, encryption handling and security features, and it makes it easier to add servers later. Whether it is worth it depends on how important the service is.
That is why load balancers are normally deployed in pairs, so the second takes over if the first fails. Cloud load balancers are built to be redundant. Redundancy should be part of the design from the start.
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