Message queuing is a form of asynchronous communication between systems and application. A producer application puts a message to the queue which then the consumer application picks it up from the queue. An email application is an example of a queue that handles “email” messages.
A microservice is a self-contained and an independently deployable service-oriented architecture component that performs a specific business functionality.
Software-defined data center or SDDC is the virtualization technology used in data centers. In other words, SDDC is a data center facility where all infrastructure elements such as networking, storage, CPU and security virtualized and delivered as a service.