Amazon SQS and Amazon SNS are two communication services offered by AWS that help deliver events to various destinations with expected behavior. SQS is a message queuing service where messages are stored in a queue, while SNS is designed for mass-communication and event distribution among many subscribers. Amazon EventBridge, a relatively new service, extends CloudWatch Events and allows developers to create event rules and schedule triggers to target services, using an Enterprise Event Bus concept. Each service has its strengths and weaknesses, including latency, throughput, and feature sets, making it essential to choose the right service for specific use cases in serverless applications. Additionally, monitoring and debugging distributed applications can be challenging without proper tools, highlighting the importance of external observability services like Lumigo.