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What is load balancing?

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Quick answer

Load balancing is spreading incoming work — like website traffic — across multiple servers so no single one gets overwhelmed. It keeps apps fast and available, and lets services handle huge numbers of users by sharing the load. It distributes work across multiple servers.

Key things to understand

  1. It distributes work across multiple servers.
  2. It prevents any single server from overloading.
  3. It keeps apps fast, reliable, and available.
  4. It enables scaling to handle huge traffic.

People also ask

What is load balancing?
Distributing incoming traffic or work across multiple servers so none becomes overwhelmed.
Why is load balancing important?
It keeps websites and apps fast and online, and lets them scale to serve many users at once.
What happens if a server fails behind a load balancer?
The balancer redirects traffic to the remaining healthy servers, keeping the service running.

Part of the guide: How the Internet Works →