Which AWS service enables you to collect and track metrics for your resources and applications?

Amazon CloudWatch is the correct answer because it is specifically designed to collect and track metrics, logs, and events for AWS resources and applications. It provides functionality to monitor performance metrics in real-time, create alarms, and visualize data, allowing users to gain insights into the health and performance of their infrastructure and applications.

CloudWatch integrates seamlessly with various AWS services, automatically gathering metrics like CPU utilization, memory usage, and disk I/O. It can also monitor custom metrics generated by applications, enabling a comprehensive monitoring solution.

Other services mentioned, like Amazon VPC, are focused on networking and not specifically designed for monitoring metrics. AWS Glue Data Catalog serves as a repository for metadata for the AWS Glue ETL service, while Amazon QuickSight provides business analytics and visualization capabilities but does not track raw metrics. Each of these services has a distinct purpose and does not overlap with the metric-tracking capabilities offered by CloudWatch.