What a load balancer does
A load balancer spreads incoming requests across more than one server. That keeps one server from being overloaded, and web applications answer faster. It matters more when visitor counts rise and fall.
The short definition is on the load balancer page.
Load balancing methods
Load balancing sends traffic by a rule. The aim is higher performance, lower delay, and a smaller chance of an outage. Common methods are:
- Round robin: requests go to servers in turn.
- Least connections: the server with the fewest open connections is chosen.
- IP hash: the same client IP keeps going to the same server.
Traffic stays balanced, so service quality holds in busy periods.
Traffic management and SEO
Traffic management is about user experience and search as well as raw speed. Search engines tend to rank sites that stay fast and available. Visitors also stay longer when pages keep responding.
The advantages are listed in the features section.
Where a load balancer fits
Load balancing helps in cases such as:
- Websites whose traffic grows quickly
- E-commerce and payment systems
- API services
- Campaigns that bring a sudden spike of visitors
- Platforms built as microservices
One server is a risk in those setups. Load balancing makes growth easier to operate.
Performance, availability, and scale
- Higher availability
- Better performance
- A lower chance of an outage
- Room to scale
- Infrastructure cost that tracks the workload
Operations teams spend less time on a single overloaded machine, and visitors see a steadier site.
How to choose a load balancer
One design does not fit every project. Look at traffic volume, who the users are, the security requirement, and how you plan to scale. The right choice is the one that matches both the budget and the performance target.
See the options on the solutions section.
Further reading
Other sources:
In short
A load balancer is a basic part of a modern web stack when you need performance and continuity. Configured for the workload, it supports both the visitor experience and search performance.
Frequently asked questions
Short answers to the questions this article is most often asked.
1 What does a load balancer do?
It spreads incoming requests across more than one server, so one machine is not overloaded and the application answers faster.
2 How do round robin and least connections differ?
Round robin sends requests to servers in turn. Least connections picks the server with the fewest open connections.
3 When is a single server a risk?
On sites whose traffic grows quickly, and on e-commerce, API, and campaign workloads, one server raises the chance of an outage.