Elastic Load Balancing automatically “balances” incoming application traffic “loads” across multiple “targets” so that no one resource becomes over burdened.  The targets can be EC2 instances, containers, and IP addresses, and can handle varying loads of application traffic in a single or multiple Availability Zones.

By distributing incoming traffic to multiple targets, Elastic Load Balancing provides fault tolerance by ensuring scalability, performance, and security.

Types of Elastic Load Balancers

There are different types of load balancers for different application needs. You can see the product comparisons to see which one may be the best fit for you: Elastic Load Balancing product comparisons.

Classic Load Balancer

Classic Load Balancer distributes traffic across multiple EC2 instances, operating in both request and connection level.  It is meant for applications built within the EC2-Classic network.  It passes requests along in a Round-Robin format. Learn more here: Classic Load Balancer.

Application Load Balancer

Application Load Balancer balances HTTP and HTTPS traffic, providing advanced request routing.  It routes traffic to targets within Virtual Private Cloud (VPC) based on the request content. Learn more here: Application Load Balancer.

Network Load Balancer

Network Load Balancer is best for distributing TCP traffic, and is optimized to handle sudden and volatile traffic patterns.  It maintains ultra-low latencies while handling millions of requests per second, routing traffic to targets within VPC. Learn more here: Network Load Balancer.

Gateway Load Balancer

Gateway Load Balancer provides one gateway to distribute traffic across multiple virtual appliances, helping you deploy, scale, and mange your third-party virtual appliances. Learn more here: Gateway Load Balancer.


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