Which AWS tool helps users visualize, analyze, and manage their AWS costs and usage over time?

AWS Cost Explorer is the correct answer because it provides a user-friendly interface to visualize, understand, and manage AWS costs and usage over time. It allows you to analyze your spending patterns, identify cost trends, and forecast future costs. You can filter data by service, region, linked account, and more, helping you optimize your AWS spending. AWS Organizations helps manage multiple AWS accounts but doesn't primarily focus on detailed cost visualization and analysis. AWS Pricing Calculator estimates costs for new solutions but doesn't analyze existing usage. AWS Service Catalog allows organizations to create and manage catalogs of IT services approved for use on AWS, not for cost analysis.