What is a Load Balancer?

A load balancer spreads incoming requests across several healthy instances of the same service.

Beginner 4 min Architecture
ClientsMany requestsLoad balancerHealth checks + routingInstance AHealthyInstance BHealthyInstance CFailing health check
One entry point, several interchangeable instances.

Hover a node to trace its connections · click or press Enter for a short explanation

Next conceptClient-Server ArchitectureClients request, servers respond, and state lives behind the server rather than on the device.