What is an Internet Gateway used for in AWS?Controls traffic on specific ports.Bridges two different VPC’sProvides SSH access to hostsProvides internet access to your VPC

An Internet Gateway in AWS is used for providing internet access to your Virtual Private Cloud (VPC). It serves as a bridge between an AWS VPC and the internet. It is not used for controlling traffic on specific ports, bridging two different VPCs, or providing SSH access to hosts.

Here's a step-by-step explanation:

1. An Internet Gateway is a horizontally scaleable, redundant, and highly available AWS managed service that does routing. It performs two main functions: to provide a target in your VPC route tables for internet-routable traffic, and to perform network address translation (NAT) for instances that have been assigned public IPv4 addresses.

2. When you create a VPC, it's automatically associated with a main route table. If you want your subnet to be a public subnet (i.e., instances in the subnet can reach the internet), you must add a route to the main route table that points all traffic (0.0.0.0/0) to the internet gateway.

3. When instances in your VPC need to access the internet, the internet gateway serves as the point of entry into your VPC. The instances send the request to the internet gateway, which in turn routes the request to the internet.

4. When a response comes back from the internet, the internet gateway routes the response back to the instances in your VPC.

So, in summary, an Internet Gateway in AWS is used to provide internet access to your VPC.