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The main difference between API Gateway and Internet Gateway is:
API Gateway is an AWS service that allows developers to create, publish, maintain, monitor, and secure APIs at any scale. It sits between the front-end (clients) and back-end (servers, databases, Lambda functions etc) of an application. Some key capabilities of API Gateway include:
- It acts as a reverse proxy and load balancer. It handles traffic management, authorization and access control for APIs.
- It supports creation of RESTful and WebSocket APIs. RESTful APIs can be used to access backends like EC2 instances, Lambda functions etc. WebSocket APIs enable real-time communication.
- It provides features like throttling, caching, monitoring, authentication, authorization etc for APIs. SDKs can also be generated.
Internet Gateway is a separately billed AWS service that allows communication between instances in VPCs and the internet. It allows instances in private subnets of a VPC to connect to the internet, but not to each other or to instances in public subnets. The internet gateway sits at the edge of a VPC and routes internet-bound traffic to the internet and vice versa.
Please refer: API Gateway- https://docs.aws.amazon.com/apigateway/latest/developerguide/welcome.html, Internet Gateway- https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Internet_Gateway.html
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