A Message Queue is a communication method used in software systems to enable different applications or services to exchange information asynchronously. It allows messages to be sent from one component to another without requiring both to be active at the same time. This decoupling helps improve system reliability and scalability, as messages can be stored in the queue until the receiving application is ready to process them. In a typical setup, a producer sends messages to the queue, while a consumer retrieves and processes them. Popular implementations of message queues include RabbitMQ, Apache Kafka, and Amazon SQS. These tools help manage the flow of data between services, ensuring that messages are delivered even during high traffic or system failures.