Which AWS service or tool provides this functionality?
AWS Config
AWS Cost and Usage Report
AWS Budgets
AWS Cost Explorer
Explanations:
AWS Config is a service that provides detailed information about the configuration of AWS resources over time. It is not specifically designed for cost analysis.
The AWS Cost and Usage Report is a comprehensive report of AWS costs and usage but does not provide graphical representations of costs.
AWS Budgets allows users to set custom cost and usage budgets and receive alerts, but it does not offer historical and current cost graphs.
AWS Cost Explorer enables users to visualize, understand, and manage AWS costs and usage over time through graphs and reports, making it ideal for the requirement.