A load balancer is a system or tool that distributes incoming network traffic across multiple servers to ensure no single server is overloaded. It improves application performance, reliability, and availability by balancing workload efficiently.
In backend systems and cloud infrastructure, load balancers help handle high traffic by routing user requests to different servers based on availability, capacity, or predefined rules. This ensures faster response times and reduces downtime.
For example:
- An e-commerce website distributes user requests across multiple servers during a sale.
- A streaming platform balances traffic so videos load smoothly for all users.
- A banking system routes login requests to different servers for stability.
- A mobile app backend uses load balancing to handle millions of users simultaneously.
Common technologies and concepts related to load balancing include:
- Traffic Distribution
- Server Clusters
- Horizontal Scaling
- Reverse Proxy
- High Availability (HA)
- Cloud Load Balancers (AWS, Azure, GCP)
- Round Robin / Least Connections Algorithms
- Failover Systems
- Network Infrastructure