Which Azure service provides a scalable message queue to decouple application components and handle traffic spikes?

Azure Queue Storage is the correct answer because it provides a scalable, durable message queuing service. It allows independent components of a cloud application to communicate asynchronously, effectively decoupling them. This is crucial for handling traffic spikes, as messages can be stored in the queue and processed at a rate the receiving component can manage, preventing overload and ensuring system stability. Azure Monitor is incorrect because it's a monitoring solution for collecting, analyzing, and acting on telemetry data from Azure and on-premises environments. Azure App Configuration is incorrect as it's used for centralizing application settings and feature flags. Azure Batch is incorrect because it's a service for running large-scale parallel and high-performance computing (HPC) applications efficiently in Azure.