AWS stands of Amazon Web Service. It offer broad range of cloud services.

Traditional vs Serverless Web hosting

TraditionalServerless
Provision CapacityRuns On-Demand (unlimited capacity Only pay for Code Executions)
Scaling (Pay too much or server issues)Scales Automatically (Pay What you need)
Update OS & SoftwareRuns on Managed AWS Infrastructure (up-to-date and secure environment)
Lots of Overhead for SPA + API AppsGreat for SPA + API Apps

API Gateway (REST API)

API Gateway is fully managed service that allows you to easily create, publish, maintain, monitor, secure API’s at any scale. An API, acts as a “front door” for applications to access data, functionality, or business logic from your backend services like servers, databases or lambda.