Elastic load balancer
An elastic load balancer, or ELB for short, has a number of noteworthy features, including the ability to perform health checks on instances. If an instance fails a health check, it automatically stops routing any traffic to it. Originally, AWS offered a single type of ELB, which is now called a classic load balancer. You can configure it to listen for TCP, SSL, HTTP and HTTPS.
For HTTP and HTTPS, it uses a least outstanding requests algorithm for routing. For other protocols, it uses simple round-robin.
The newer type of ELB is called an application load balancer. This allows you to route requests, based upon the content of the request. For example, a request for different microservices, could go to different backend ...
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