Which AWS service or tool helps users visualize, understand, and manage spending and usage over time?

Explanations:

AWS Organizations is used for managing multiple AWS accounts but does not specifically help visualize spending.

AWS Pricing Calculator is a tool for estimating costs but does not provide visualization of actual spending and usage.

AWS Cost Explorer allows users to visualize, understand, and manage their AWS spending and usage over time.

AWS Service Catalog is for creating and managing approved AWS resources but does not focus on spending visualization.