What is the purpose of NAT Gateway when we already have Internet Gateway?

Question

Dhananjeyan Gopal · Accepted Answer

The IGW allows the both traffics i.e., from instances in public subnet to internet and from internet to instances in public. There are some situations where the instances kept in private subnet need to connect to the internet to do software updates security patching etc, but these instances should not be accessed by the public. In such cases the IGW can’t be used whereas the NAT gateway is used which allows only the outbound traffic i.e., private subnets to access the internet but not the vice versa.

Santhosh Kumar · Answer

rivate instances cannot access the internet directly, so a NAT gateway is used to allow private instances to access the internet for outbound traffic, but not for incoming traffic

What is the purpose of NAT Gateway when we already have Internet Gateway?

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