What is the use of a Private Subnet in a VPC

Question

Can someone explain me the need of having a private subnet in a VPC? Thank you in advance.

Answer 1

Private subnets are available across all AWS Availability Zones. Even if AWS CloudHSM is not supported in a certain Availability Zone, the HSM cluster still performs as expected if support is added later.

For more information on private subnet:

https://docs.aws.amazon.com/cloudhsm/latest/userguide/create-subnets.html

https://www.edureka.co/blog/amazon-vpc-tutorial/