Why AWS Cost Categories?
AWS Cost Categories is a feature within AWS Cost Management product suite that enables you to group cost and usage information into meaningful categories based on your needs. You can create custom categories and map your cost and usage information into these categories based on the rules defined by you using various dimensions such as account, tag, service, charge type, and even other cost categories. Once cost categories are set up and enabled, you will be able to view your cost and usage information by these categories starting at the beginning of the month in AWS Cost Explorer, AWS Budgets, and AWS Cost and Usage Report (CUR).
Benefits
AWS Cost Categories now supports resource and tag based access controls
Define fine-grained permissions based on resource names and tags, improving governance and information security through these two granular access control features.