Which AWS service is used for monitoring and logging in real-time?

Amazon CloudWatch is the service specifically designed for monitoring and logging in real-time on AWS. It provides a comprehensive solution for tracking various metrics from your AWS resources, applications, and services, enabling users to monitor the health and performance of their systems effectively. CloudWatch allows users to set up alarms based on specific metrics, view logs from different services, and gain insights through dashboards, creating an integrated monitoring experience.

In contrast, the other services mentioned have different primary functions. For instance, Amazon CloudFront is a content delivery network service that accelerates the delivery of static and dynamic web content, while Amazon EC2 provides scalable computing capacity in the cloud. Amazon RDS is a managed database service that simplifies the setup, operation, and scaling of relational databases but does not focus on monitoring and logging. Therefore, when it comes to real-time monitoring and logging, Amazon CloudWatch is the clear choice.