The Cloud Formation template we created in part one provide a simple, reusable way to create a simple VPC. However, this template is not as flexible as it can be. We would like to have a template that can build a VPC with a varying number of subnets to handle development vs test vs production usage. We would like something that could create public-only subnets if we needed to quickly create something for demo / POC purposes. nstead of creating separate templates for these cases, we can make our existing template more flexible by using Parameters, Conditions, Mappings, and Outputs.