AWS Certified Cloud Practitioner

Explanation

Amazon Simple Queue Service (Amazon SQS) is the correct answer because it is specifically designed to decouple application components in a microservices architecture.

Key Points:

• Decoupling: SQS allows different components of an application to communicate asynchronously through message queues, enabling them to operate independently
• Microservices: When breaking down monolithic applications into microservices, SQS provides reliable message queuing between services
• Scalability: Each microservice can scale independently while communicating through SQS queues
• Reliability: SQS ensures messages are delivered reliably even if services are temporarily unavailable

Why other options are incorrect:

• AWS Direct Connect: Provides dedicated network connection from on-premises to AWS, not for application decoupling
• Amazon Lightsail: Simplified virtual private server (VPS) service for simple web applications
• Amazon CloudWatch: Monitoring and observability service, not for application decoupling

SQS is a core AWS service for building loosely coupled, distributed systems and is commonly used in microservices architectures.