An API Gateway is a server that is the single entry point into the system. It is similar to the Facade pattern from object‑oriented design. The API Gateway encapsulates the internal system architecture and provides an API that is tailored to each client.What is Amazon API gateway?
Amazon API Gateway is an Amazon Web Services (AWS) service offering that allows a developer to connect non-AWS applications to AWS back-end resources, such as servers or code. Amazon API Gateway allows an AWS customer to increase the overall utility of Amazon’s other cloud services.