Additional Core AWS Services                       

AWS has its core services — S3, EC2, Amazon Glacier, and Amazon EBS,for example — but that’s not the end of the story. 

 

The “additional” services integrate and make the foundational services more useful. They help you build better applications by using the foundational storage and computing services offered by AWS. For example, Elastic Load Balancer (ELB) is an additional service that Amazon offers in order to distribute traffic to multiple web servers, enabling your application to support more traffic than can be handled by a single webserver. You don’t need an ELB to deploy a basic AWS application, but the service makes it much easier to run a high-traffic, AWS-based web application.