Which AWS services can be used to decouple components of a microservices based application on AWS Cloud?

There are several AWS services that can be used to decouple components of a microservices based application on AWS Cloud:

1. Amazon Simple Queue Service (SQS): This is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. SQS eliminates the complexity and overhead associated with managing and operating message oriented middleware, and empowers developers to focus on differentiating work.

2. Amazon Simple Notification Service (SNS): This is a fully managed messaging service for both application-to-application (A2A) and application-to-person (A2P) communication. The A2A pub/sub functionality provides topics for high-throughput, push-based, many-to-many messaging between distributed systems, microservices, and event-driven serverless applications.

3. AWS Lambda: This is a serverless compute service that lets you run your code without provisioning or managing servers. With Lambda, you can design and create applications that are automatically triggered by AWS services such as modifications to objects in Amazon S3 buckets, updates to tables in DynamoDB, custom events generated by your applications, etc.

4. Amazon Kinesis: This is a platform for streaming data on AWS, offering powerful services to make it easy to load and analyze streaming data, and also providing the ability for you to build custom streaming data applications for specialized needs.

5. Amazon EventBridge: This is a serverless event bus that makes it easy to connect applications together using data from your own applications, integrated Software-as-a-Service (SaaS) applications, and AWS services.

6. AWS Step Functions: This service lets you coordinate multiple AWS services into serverless workflows so you can build and update apps quickly. Using Step Functions, you can design and run workflows that stitch together services such as AWS Lambda and Amazon ECS into feature-rich applications.

These services can be used individually or in combination to achieve the desired level of decoupling in a microservices architecture.